Ultrastructure of the placenta of Antarctic seals during the first third of pregnancy.
D000818:Animals; D000864:Antarctic Regions; D010872:Caniformia / Q000033:anatomy & histology*; D005260:Female; D005865:Gestational Age; D010920:Placenta / Q000648:ultrastructure*; D011247:Pregnancy; D011270:Pregnancy, Animal; D046048:Seals, Earless / Q000033:anatomy & histology*