title: A neurotransmitter system theory of sexual orientation.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Fitzgerald
mesh_terms: D001921:Brain / Q000502:physiology; D001923:Brain Chemistry / Q000502:physiology*; D004644:Emotions / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D009638:Norepinephrine / Q000502:physiology*; D011606:Psychosexual Development / Q000502:physiology*; D012701:Serotonin / Q000502:physiology*; D012727:Sex Characteristics; D019529:Sexuality / Q000502:physiology*
chemical_list: D012701:Serotonin; D009638:Norepinephrine