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Results 1 - 1 of 1 for Decreased heart rate variability
  1. 48,XXYY syndrome 
    ... affects male development. There is a lot of variability in symptoms between people with 48,XXYY syndrome. ... individuals have developmental delays in infancy and develop decreased ... rates of other neurodevelopmental and behavioral disorders, such as ...
    https://medlineplus.gov/genetics/condition/48xxyy-syndrome - Genetics