title: Aspects of the pathophysiology of the first trimester of pregnancy.
mesh_terms: D000022:Abortion, Spontaneous / Q000209:etiology*; D000013:Congenital Abnormalities / Q000503:physiopathology; D005260:Female; D005333:Fetus / Q000276:immunology; D006680:HLA Antigens / Q000009:adverse effects; D006801:Humans; D010927:Placental Insufficiency / Q000150:complications; D010929:Placentation; D011247:Pregnancy; D011261:Pregnancy Trimester, First
chemical_list: D006680:HLA Antigens