title: On control of spontaneous testicular regression in tree sparrows (Spizella arborea).
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002628:Chemoreceptor Cells / Q000502:physiology; D002784:Cholesterol / Q000494:pharmacology; D003534:Cyproterone / Q000494:pharmacology; D007031:Hypothalamus / Q000502:physiology; D008297:Male; D009929:Organ Size; D010775:Photic Stimulation; D013737:Testis / Q000033:anatomy & histology / Q000502:physiology*; D013739:Testosterone / Q000502:physiology*; D013997:Time Factors
chemical_list: D013739:Testosterone; D002784:Cholesterol; D003534:Cyproterone