Inheritance Patterns in Family Trees
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Inheritance Patterns in Family Trees

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Questions and Answers

What type of inheritance is most likely indicated by individuals with the condition in every generation?

  • Mitochondrial inheritance
  • Autosomal dominant (correct)
  • X-linked recessive
  • Autosomal recessive
  • Which characteristic suggests that the condition may be X-linked dominant?

  • Affected individuals have no affected parents
  • Affected individuals are found sporadically
  • All daughters of an affected male are affected (correct)
  • Sons of affected males are all affected
  • Why is consanguinity important in analyzing inheritance patterns?

  • It confirms all inheritance is dominant
  • It has no impact on inheritance
  • It increases the risk of autosomal recessive conditions (correct)
  • It eliminates the possibility of X-linked conditions
  • What is one limitation of interpreting a family tree for genetic conditions?

    <p>It may only suggest hypotheses that require further molecular analysis</p> Signup and view all the answers

    When might a condition be classified as autosomal recessive based on family tree analysis?

    <p>There are consanguineous marriages in the family</p> Signup and view all the answers

    What can be inferred if a father is affected and all his daughters are also affected while his sons are unaffected?

    <p>The condition is X-linked dominant</p> Signup and view all the answers

    Which inheritance pattern might best explain a scenario where affected females have both affected and unaffected offspring?

    <p>X-linked dominant inheritance</p> Signup and view all the answers

    What characteristic of mitochondrial inheritance distinguishes it from other types of genetic inheritance?

    <p>It is inherited exclusively from the mother.</p> Signup and view all the answers

    Which statement correctly describes the mutation rates of mitochondrial DNA compared to nuclear DNA?

    <p>Mitochondrial DNA has a mutation rate ten times higher than that of nuclear DNA.</p> Signup and view all the answers

    What phenomenon contributes to the high variability in the expression of mitochondrial diseases?

    <p>The potential for homoplasmy or heteroplasmy.</p> Signup and view all the answers

    Which organ systems are most affected by mitochondrial diseases?

    <p>Nervous system and muscular systems.</p> Signup and view all the answers

    What is a characteristic feature of mitochondrial DNA compared to nuclear DNA?

    <p>Mitochondrial DNA lacks histones and has a circular form.</p> Signup and view all the answers

    What is the main characteristic of a causative mutation in relation to affected individuals?

    <p>It is found more frequently in affected individuals than in those who are not affected.</p> Signup and view all the answers

    Which of the following statements about dynamic mutations is true?

    <p>They involve expansion of trinucleotide repeats.</p> Signup and view all the answers

    What is a likely consequence of biallelic mutations in terms of disease prevalence?

    <p>They can lead to recessive conditions with many healthy carriers.</p> Signup and view all the answers

    Which type of mutation is most likely to cause a dominant disease?

    <p>Monoallelic mutations.</p> Signup and view all the answers

    In the context of sex-linked inheritance, which statement is correct?

    <p>Phenotypes can manifest unequally between males and females.</p> Signup and view all the answers

    What describes the risk associated with exceeding the thresholds of trinucleotide repeats?

    <p>It can elevate the risk of developing symptoms of the related disease.</p> Signup and view all the answers

    Which genetic condition is associated with the CGG repeat expansion?

    <p>Fragile X syndrome</p> Signup and view all the answers

    What is one potential outcome of severe dominant mutations affecting fertility?

    <p>Limited reproductive capacity of the affected individuals.</p> Signup and view all the answers

    Which mutation type is less likely to impact genetic conditions compared to others?

    <p>Biallelic mutations.</p> Signup and view all the answers

    What is the primary feature of diseases characterized by anticipation?

    <p>Earliest onset and increasingly severe phenotype in successive generations</p> Signup and view all the answers

    Which of the following best defines Sherman’s paradox in relation to fragile X syndrome?

    <p>Recessive x-linked condition with percentage of males exhibiting a normal phenotype</p> Signup and view all the answers

    What is the role of the FMRP protein in neurons?

    <p>It regulates the translation of specific mRNAs</p> Signup and view all the answers

    What occurs when the number of trinucleotide repeats in the FMR1 gene exceeds 200?

    <p>Methylation of the FMR1 gene leads to its inactivation</p> Signup and view all the answers

    Why are females with premutations of the FMR1 gene at risk for premature menopause?

    <p>They undergo accelerated ovarian degeneration</p> Signup and view all the answers

    What genetic characteristic is primarily responsible for fragile X syndrome?

    <p>Defect on the q arm of chromosome X at locus Xq27.3</p> Signup and view all the answers

    What is the significance of the premutation range of 50 to just under 200 repeats in the context of fragile X syndrome?

    <p>Individuals maintain a normal phenotype but risk passing on the mutation</p> Signup and view all the answers

    How does the structure of dendritic spines in affected individuals with fragile X syndrome differ from those in healthy individuals?

    <p>They are longer and maintain their immature length</p> Signup and view all the answers

    What method can be used to diagnose fragile X syndrome by examining the FMR1 gene?

    <p>Southern blot analysis</p> Signup and view all the answers

    What type of behavior is often observed in children with fragile X syndrome aside from cognitive deficits?

    <p>Hyperactivity and attention deficits</p> Signup and view all the answers

    What is the mechanism by which Huntington’s disease leads to neuron degeneration?

    <p>Increased apoptosis of neurons and protein aggregation</p> Signup and view all the answers

    Which of the following best describes the genetic nature of Myotonic Muscular Dystrophy (MD1)?

    <p>Autosomal dominant inheritance with anticipation</p> Signup and view all the answers

    What triplet repeat expansion is responsible for Myotonic Muscular Dystrophy?

    <p>CTG in the 3' untranslated region</p> Signup and view all the answers

    Which symptom is NOT typically associated with Myotonic Muscular Dystrophy?

    <p>Uncontrolled choreiform movements</p> Signup and view all the answers

    What is the significance of the CAG repeat length in Huntington’s disease?

    <p>It determines the likelihood of developing symptoms and their severity</p> Signup and view all the answers

    What is the expected outcome when CTG triplet repeats exceed 50 in Myotonic Muscular Dystrophy?

    <p>Increased risk of severe symptoms</p> Signup and view all the answers

    What role does the Huntingtin protein play in Huntington's disease?

    <p>It plays a role in maintaining nuclear transport and cellular integrity</p> Signup and view all the answers

    In which populations is anticipation observed with Myotonic Muscular Dystrophy?

    <p>Both maternal and paternal lineages</p> Signup and view all the answers

    What psychological symptoms initially appear in Huntington’s disease?

    <p>Depression, irritability, and decision-making difficulties</p> Signup and view all the answers

    What form of myotonic dystrophy involves a tetranucleotide repeat?

    <p>Myotonic Dystrophy Type 2 (MD2)</p> Signup and view all the answers

    Why might autosomal recessive conditions be prioritized over X-linked recessive conditions in family tree analyses involving consanguineous marriages?

    <p>Autosomal recessive conditions are more numerous and consanguinity significantly increases the probability of such conditions appearing in offspring.</p> Signup and view all the answers

    What kind of inheritance pattern does vertical transmission suggest in a family tree with affected individuals present in every generation?

    <p>Vertical transmission typically suggests an autosomal dominant inheritance pattern due to the presence of affected individuals in each generation.</p> Signup and view all the answers

    How can the presence of affected daughters and unaffected sons in a family tree indicate a likely X-linked dominant inheritance pattern?

    <p>This indicates that the affected father transmits the condition to all daughters while not transmitting it to sons, who inherit his Y chromosome.</p> Signup and view all the answers

    In what way does a small family tree limit the analysis of inheritance patterns, particularly concerning X-linked conditions?

    <p>A small family tree may not provide enough data to conclusively determine if an X-linked condition is present, as the effects may simply be coincidental.</p> Signup and view all the answers

    What implications do consanguineous marriages have on the probability of finding autosomal recessive conditions in family trees?

    <p>Consanguineous marriages significantly increase the risk of autosomal recessive conditions due to the likelihood of both partners carrying the same recessive alleles.</p> Signup and view all the answers

    What are the implications of incomplete penetrance in identifying causative mutations in genetic disorders?

    <p>Incomplete penetrance suggests that a causative mutation may be present in affected individuals, while not all carriers exhibit the phenotype, complicating the identification process.</p> Signup and view all the answers

    How does compound heterozygosity impact the inheritance patterns of recessive disorders?

    <p>Compound heterozygosity can result from having two different mutations in both alleles, increasing the likelihood of expressing recessive disorders in a population with many healthy carriers.</p> Signup and view all the answers

    Explain the significance of dynamic mutations in the context of interindividual genetic variability?

    <p>Dynamic mutations contribute to interindividual variability by exhibiting polymorphic traits, where variations in trinucleotide repeats can lead to health implications in some individuals.</p> Signup and view all the answers

    Describe the characteristics and consequences of monoallelic mutations on reproductive fitness.

    <p>Monoallelic mutations can lead to autosomal dominant disorders which may severely affect reproductive fitness, potentially leading to limited reproductive capacity in affected individuals.</p> Signup and view all the answers

    What thresholds are used to assess the risk associated with trinucleotide repeat expansions, and how do they relate to disease expression?

    <p>Thresholds determine when increased expansions in trinucleotide repeats transition from a benign polymorphism to a risk factor for disease; crossing these thresholds can result in symptomatic expression.</p> Signup and view all the answers

    What does the phenomenon of anticipation refer to in genetic conditions like fragile X syndrome?

    <p>Anticipation refers to the earlier onset and increasing severity of symptoms in successive generations of affected individuals.</p> Signup and view all the answers

    How do the dendritic spines in affected individuals with fragile X syndrome differ from those in healthy individuals?

    <p>Individuals with fragile X syndrome exhibit elongated immature dendritic spines compared to the shorter, mature spines seen in healthy individuals.</p> Signup and view all the answers

    What genetic change occurs when the number of CGG repeats in the FMR1 gene exceeds 200?

    <p>When CGG repeats exceed 200, it leads to methylation of the gene, thereby inactivating the FMR1 gene and causing fragile X syndrome.</p> Signup and view all the answers

    What is the relationship between the number of trinucleotide repeats and disease risk in individuals with fragile X syndrome?

    <p>Individuals with 50 to just under 200 repeats are in a premutation range, which poses a risk for having affected children, while over 200 repeats leads to the disease.</p> Signup and view all the answers

    Describe the role of the FMRP protein in the context of fragile X syndrome.

    <p>FMRP regulates the translation of specific mRNAs that are essential for synaptic plasticity and neuronal maturation.</p> Signup and view all the answers

    What challenges does Sherman’s paradox present in understanding fragile X syndrome inheritance?

    <p>Sherman's paradox highlights that a significant number of male carriers with the mutated allele can present normal phenotypes, complicating the expected inheritance patterns.</p> Signup and view all the answers

    How can the fragile X syndrome be diagnosed through genetic testing?

    <p>Fragile X syndrome can be diagnosed by analyzing the expansion of the FMR1 gene using methods like southern blot analysis.</p> Signup and view all the answers

    What cognitive and behavioral characteristics are commonly associated with children affected by fragile X syndrome?

    <p>Children with fragile X syndrome often exhibit cognitive deficits, language delays, hyperactivity, sensitivity to stimuli, and sometimes autistic behaviors.</p> Signup and view all the answers

    Explain the phenomenon of anticipation in the context of Myotonic Muscular Dystrophy.

    <p>Anticipation in Myotonic Muscular Dystrophy refers to the increasing severity and earlier onset of symptoms in successive generations, primarily inherited from female carriers due to the expansion of CTG repeats.</p> Signup and view all the answers

    What distinguishes Huntington’s disease in terms of symptom onset and genetic threshold compared to Myotonic Muscular Dystrophy?

    <p>Huntington's disease exhibits a late onset of symptoms typically after 40 years of age and requires 40 CAG repeats to be affected, while Myotonic Muscular Dystrophy shows variable expressivity with symptoms appearing at different repeat lengths.</p> Signup and view all the answers

    How does the expanded CAG repeat in Huntington’s disease affect the functionality of the Huntingtin protein?

    <p>An expanded CAG repeat leads to a polyglutamine stretch in the Huntingtin protein, resulting in abnormal protein aggregation which disrupts cellular processes and leads to neuron degeneration.</p> Signup and view all the answers

    What are some potential systemic effects associated with Myotonic Muscular Dystrophy aside from muscle weakness?

    <p>Myotonic Muscular Dystrophy can also present with early cataracts, heart rhythm abnormalities, and thyroid dysfunction, indicating that it affects multiple organ systems.</p> Signup and view all the answers

    Describe the relationship between trinucleotide repeat length and the expression of symptoms in both Myotonic Muscular Dystrophy and Huntington’s disease.

    <p>In both conditions, longer repeat lengths are associated with more severe symptoms; in Myotonic Muscular Dystrophy, over 50 CTG repeats leads to overt symptoms, whereas in Huntington’s disease, 40 or more CAG repeats indicates an affected status.</p> Signup and view all the answers

    Discuss the role of maternal transmission in the anticipation phenomenon seen in Myotonic Muscular Dystrophy.

    <p>Maternal transmission plays a key role in anticipation as premutated females are more likely to pass on expanded CTG repeats to their offspring, resulting in earlier onset and increased severity of symptoms in affected children.</p> Signup and view all the answers

    What implications arise from the genetic testing for conditions like Huntington’s disease, particularly concerning ethical considerations?

    <p>Genetic testing for Huntington’s disease raises ethical concerns about predictive testing and the psychological impact on individuals who may carry the mutation but are asymptomatic.</p> Signup and view all the answers

    Study Notes

    Family Tree Inheritance Analysis

    • Interpretation of family trees allows for hypotheses on genetic inheritance types, with no definitive conclusions.
    • Autosomal dominant conditions exhibit equal male and female incidence, with affected individuals in every generation (vertical transmission).
    • X-linked recessive conditions primarily affect males; however, small family trees can skew perceptions of inheritance patterns.
    • Consanguineous marriages increase the likelihood of autosomal recessive conditions due to increased homozygosity.
    • High presence of healthy carriers of autosomal recessive mutations maintains their prevalence in a population.

    Modes of Genetic Inheritance

    • Monoallelic Mutations: Can cause autosomal dominant or X-linked dominant disorders, occasionally leading to recessive conditions in males.
    • Biallelic Mutations: Typically result in recessive conditions, with carriers maintaining the mutation in the population despite potential severe impacts on affected individuals.
    • Complications arise with incomplete penetrance, where not all individuals with a causative mutation show symptoms.

    Dynamic Mutations

    • Characterized by expansions of trinucleotide repeats, these mutations can lead to various genetic diseases.
    • Major conditions due to dynamic mutations include:
      • Fragile X Syndrome: Linked to CGG expansion on the X chromosome, associated with cognitive deficits and behavioral issues.
      • Myotonic Dystrophy: Caused by CTG expansions on chromosome 19, leading to progressive muscle weakness and other systemic issues.
      • Huntington's Disease: Resulting from CAG repeats on chromosome 4, leading to neurodegeneration with late onset symptoms.

    Anticipation in Genetic Disorders

    • Dynamic mutations often show anticipation, characterized by earlier onset and increased severity in successive generations.
    • In diseases like Fragile X, carriers can have normal phenotypes yet produce affected offspring due to repeat expansions.

    Fragile X Syndrome Details

    • Genetic basis linked to the FMR1 gene on chromosome X, encoding FMRP protein crucial for neuronal function.
    • Symptoms include cognitive deficits, hypersensitivity, and macroorchidism, alongside various X-linked mental retardation disorders.
    • Sherman’s paradox highlights the complexity of X-linked inheritance with penetrance variability.

    Myotonic Dystrophy Characteristics

    • Dominantly inherited disorder, associated with myotonic phenomenon and multi-system involvement, including cataracts and heart issues.
    • Both forms of myotonic dystrophy exhibit anticipation phenomena, often expanding through maternal transmission.

    Huntington’s Disease Overview

    • First described by George Huntington, characterized by progressive neurological decline linked to mutations in the Huntingtin gene.
    • The expansion of CAG repeats leads to cytotoxic protein aggregation, primarily affecting the basal ganglia and cortex.
    • Age of onset typically occurs around 40 years, with increasing severity correlating with repeat length.
    • Ethical considerations arise around genetic testing for predisposition without known interventions.

    General Considerations

    • Inbreeding and isolated populations heighten risks for recessive condition manifestations.
    • Identifying causative mutations remains vital for understanding genetic diseases, with recurrent traits guiding potential treatment strategies.### Symptoms and Progression of the Disease
    • Uncontrolled movements resembling dancing appear in the second stage, followed by dementia in the third stage.
    • Disease progression is highly individual but generally leads to death.
    • Current therapies involve cystamine, which inhibits transglutaminase, potentially beneficial depending on the disease's true pathogenesis.

    Mitochondrial Inheritance

    • Characterized by complete maternal inheritance (matrilinear disease); mutations from only maternal mitochondrial DNA can affect offspring.
    • Mitochondria vary in number across cell types, ranging from hundreds to thousands, and may contain multiple copies of DNA (approximately 10 per organelle).
    • Mitochondrial DNA (mtDNA) is more susceptible to somatic mutations, estimated to mutate ten times faster than nuclear DNA.

    Threshold Effects and Disease Manifestation

    • More than 85% of mutated mtDNA copies can lead to dysfunctional cellular functions and altered phenotypes.
    • Mitochondrial DNA is circular, lacks protective proteins, and has limited DNA repair mechanisms, increasing mutation susceptibility.
    • Mitochondrial diseases exhibit incomplete penetrance, variable expressivity, and pleiotropy, complicating inheritance predictions.

    Examples of Mitochondrial Diseases

    • Leber's Syndrome: Optic neuropathy with vision loss and cardiac issues, caused by mutations affecting complex I components.
    • MELAS: Stands for Myopathy, Encephalopathy, Lactic Acidosis, Stroke; linked to mutations in mitochondrial transfer RNA.

    Energy Demand and Mitochondrial Disease Effects

    • Most symptoms arise in organs with high energy demands: nervous system, muscles, eyes, liver.
    • Typically, these diseases manifest in adulthood.

    Mitochondrial Genetic Complexity

    • Mitochondrial mutations lead to heterogeneous inheritance patterns, allowing for either homoplasmy (all mtDNA normal or mutated) or heteroplasmy (mixed mtDNA).
    • Heteroplasmy is a significant factor in the variability and transmission of mitochondrial diseases.

    Inheritance Challenges

    • Predicting transmission of mitochondrial diseases is challenging due to variable mutant DNA proportions and the bottleneck effect during oogenesis.
    • Oocytes undergo a drop in mtDNA copies from approximately 500,000 in mature oocytes to as low as 200 in primordial germ cells, complicating mutation inheritance predictions.

    Applications of mtDNA Research

    • High mutation rate of mtDNA aids anthropological studies, revealing variations dating back around 150,000 years.
    • In legal medicine, mtDNA serves as a valuable genetic marker for comparing crime scene evidence with suspects’ genotypes.

    Family Tree Inheritance Analysis

    • Interpretation of family trees allows for hypotheses on genetic inheritance types, with no definitive conclusions.
    • Autosomal dominant conditions exhibit equal male and female incidence, with affected individuals in every generation (vertical transmission).
    • X-linked recessive conditions primarily affect males; however, small family trees can skew perceptions of inheritance patterns.
    • Consanguineous marriages increase the likelihood of autosomal recessive conditions due to increased homozygosity.
    • High presence of healthy carriers of autosomal recessive mutations maintains their prevalence in a population.

    Modes of Genetic Inheritance

    • Monoallelic Mutations: Can cause autosomal dominant or X-linked dominant disorders, occasionally leading to recessive conditions in males.
    • Biallelic Mutations: Typically result in recessive conditions, with carriers maintaining the mutation in the population despite potential severe impacts on affected individuals.
    • Complications arise with incomplete penetrance, where not all individuals with a causative mutation show symptoms.

    Dynamic Mutations

    • Characterized by expansions of trinucleotide repeats, these mutations can lead to various genetic diseases.
    • Major conditions due to dynamic mutations include:
      • Fragile X Syndrome: Linked to CGG expansion on the X chromosome, associated with cognitive deficits and behavioral issues.
      • Myotonic Dystrophy: Caused by CTG expansions on chromosome 19, leading to progressive muscle weakness and other systemic issues.
      • Huntington's Disease: Resulting from CAG repeats on chromosome 4, leading to neurodegeneration with late onset symptoms.

    Anticipation in Genetic Disorders

    • Dynamic mutations often show anticipation, characterized by earlier onset and increased severity in successive generations.
    • In diseases like Fragile X, carriers can have normal phenotypes yet produce affected offspring due to repeat expansions.

    Fragile X Syndrome Details

    • Genetic basis linked to the FMR1 gene on chromosome X, encoding FMRP protein crucial for neuronal function.
    • Symptoms include cognitive deficits, hypersensitivity, and macroorchidism, alongside various X-linked mental retardation disorders.
    • Sherman’s paradox highlights the complexity of X-linked inheritance with penetrance variability.

    Myotonic Dystrophy Characteristics

    • Dominantly inherited disorder, associated with myotonic phenomenon and multi-system involvement, including cataracts and heart issues.
    • Both forms of myotonic dystrophy exhibit anticipation phenomena, often expanding through maternal transmission.

    Huntington’s Disease Overview

    • First described by George Huntington, characterized by progressive neurological decline linked to mutations in the Huntingtin gene.
    • The expansion of CAG repeats leads to cytotoxic protein aggregation, primarily affecting the basal ganglia and cortex.
    • Age of onset typically occurs around 40 years, with increasing severity correlating with repeat length.
    • Ethical considerations arise around genetic testing for predisposition without known interventions.

    General Considerations

    • Inbreeding and isolated populations heighten risks for recessive condition manifestations.
    • Identifying causative mutations remains vital for understanding genetic diseases, with recurrent traits guiding potential treatment strategies.### Symptoms and Progression of the Disease
    • Uncontrolled movements resembling dancing appear in the second stage, followed by dementia in the third stage.
    • Disease progression is highly individual but generally leads to death.
    • Current therapies involve cystamine, which inhibits transglutaminase, potentially beneficial depending on the disease's true pathogenesis.

    Mitochondrial Inheritance

    • Characterized by complete maternal inheritance (matrilinear disease); mutations from only maternal mitochondrial DNA can affect offspring.
    • Mitochondria vary in number across cell types, ranging from hundreds to thousands, and may contain multiple copies of DNA (approximately 10 per organelle).
    • Mitochondrial DNA (mtDNA) is more susceptible to somatic mutations, estimated to mutate ten times faster than nuclear DNA.

    Threshold Effects and Disease Manifestation

    • More than 85% of mutated mtDNA copies can lead to dysfunctional cellular functions and altered phenotypes.
    • Mitochondrial DNA is circular, lacks protective proteins, and has limited DNA repair mechanisms, increasing mutation susceptibility.
    • Mitochondrial diseases exhibit incomplete penetrance, variable expressivity, and pleiotropy, complicating inheritance predictions.

    Examples of Mitochondrial Diseases

    • Leber's Syndrome: Optic neuropathy with vision loss and cardiac issues, caused by mutations affecting complex I components.
    • MELAS: Stands for Myopathy, Encephalopathy, Lactic Acidosis, Stroke; linked to mutations in mitochondrial transfer RNA.

    Energy Demand and Mitochondrial Disease Effects

    • Most symptoms arise in organs with high energy demands: nervous system, muscles, eyes, liver.
    • Typically, these diseases manifest in adulthood.

    Mitochondrial Genetic Complexity

    • Mitochondrial mutations lead to heterogeneous inheritance patterns, allowing for either homoplasmy (all mtDNA normal or mutated) or heteroplasmy (mixed mtDNA).
    • Heteroplasmy is a significant factor in the variability and transmission of mitochondrial diseases.

    Inheritance Challenges

    • Predicting transmission of mitochondrial diseases is challenging due to variable mutant DNA proportions and the bottleneck effect during oogenesis.
    • Oocytes undergo a drop in mtDNA copies from approximately 500,000 in mature oocytes to as low as 200 in primordial germ cells, complicating mutation inheritance predictions.

    Applications of mtDNA Research

    • High mutation rate of mtDNA aids anthropological studies, revealing variations dating back around 150,000 years.
    • In legal medicine, mtDNA serves as a valuable genetic marker for comparing crime scene evidence with suspects’ genotypes.

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    Description

    This quiz focuses on interpreting family trees to hypothesize potential inheritance patterns. It encourages you to analyze the provided family tree and make educated guesses about the type of inheritance, emphasizing that outcomes must be confirmed by molecular analysis. The emphasis is on probability and interpretation rather than definitive answers.

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