title: Monozygotic twins concordant for Prader-Willi syndrome.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D002648:Child; D004200:Diseases in Twins; D006801:Humans; D007006:Hypogonadism / Q000235:genetics*; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male; D009765:Obesity / Q000235:genetics