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Results 1 - 1 of 1 for Increased heart rate variability
  1. 48,XXYY syndrome 
    ... affects male development. There is a lot of variability in symptoms between people with 48,XXYY syndrome. ... poor muscle development, low energy levels, and an increased risk of breast ... rates of other neurodevelopmental and behavioral disorders, such as ...
    https://medlineplus.gov/genetics/condition/48xxyy-syndrome - Genetics