title: Why circulating levels of trophoblast-specific proteins may be normal in ectopic pregnancy.
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood*; D005260:Female; D006023:Glycoproteins / Q000097:blood*; D006465:Hemoperitoneum / Q000097:blood; D006801:Humans; D011247:Pregnancy; D011274:Pregnancy, Tubal / Q000097:blood*; D012422:Rupture, Spontaneous; D014327:Trophoblasts; D014680:Veins
chemical_list: D006063:Chorionic Gonadotropin; D006023:Glycoproteins