A presomite human embryo showing a yolk-sac duct.
D000328:Adult; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D004997:Ethinyl Estradiol / Q000627:therapeutic use; D005321:Extraembryonic Membranes / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D009640:Norethindrone / Q000627:therapeutic use; D010784:Photomicrography; D011247:Pregnancy
D004997:Ethinyl Estradiol; D009640:Norethindrone