title: Plasma testosterone titers during the annual reproductive cycle of starlings (Sturnus vulgaris).
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D005837:Genitalia, Male / Q000033:anatomy & histology*; D007985:Leydig Cells / Q000166:cytology; D008297:Male; D009929:Organ Size; D012621:Seasons; D012669:Seminal Vesicles / Q000033:anatomy & histology; D012726:Sexual Behavior, Animal; D013091:Spermatogenesis; D013737:Testis / Q000033:anatomy & histology; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone