title: Monozygotic twins discordant for homosexuality: report of a pair and significance of the phenomenon.
mesh_terms: D000328:Adult; D004200:Diseases in Twins; D005260:Female; D006716:Homosexuality / Q000235:genetics*; D006801:Humans; D008297:Male; D011247:Pregnancy; D014427:Twins; D014430:Twins, Monozygotic