title: Homosexuality in female monozygotic twins.
mesh_terms: D000293:Adolescent; D000328:Adult; D004200:Diseases in Twins; D005260:Female; D005306:Fertilization; D005838:Genotype; D006716:Homosexuality / Q000235:genetics*; D006801:Humans; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D010063:Ovum; D012730:Sex Chromosomes; D012737:Sex Factors