title: Sources and levels of progesterone during pregnancy in the garter snake, Thamnophis elegans.
mesh_terms: D000311:Adrenal Glands / Q000502:physiology; D000315:Adrenalectomy; D000818:Animals; D002369:Castration; D002467:Cell Nucleus / Q000648:ultrastructure; D003338:Corpus Luteum / Q000033:anatomy & histology / Q000098:blood supply / Q000378:metabolism*; D005260:Female; D008184:Luteal Cells / Q000648:ultrastructure; D008297:Male; D010053:Ovary / Q000502:physiology; D010920:Placenta / Q000502:physiology / Q000601:surgery; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood / Q000378:metabolism*; D012911:Snakes / Q000502:physiology*; D013799:Theca Cells / Q000166:cytology; D013997:Time Factors; D014617:Vacuoles / Q000648:ultrastructure
chemical_list: D011374:Progesterone