Insufficiency of the cervix uteri.
D000033:Abortion, Threatened; D000328:Adult; D002584:Cervix Uteri / Q000032:analysis / Q000098:blood supply / Q000294:innervation; D003094:Collagen / Q000032:analysis; D005260:Female; D006801:Humans; D011247:Pregnancy; D002577:Uterine Cervical Diseases / Q000473:pathology / Q000601:surgery
D003094:Collagen