title: Increased PGI2 activity in venous tissues from rats on oral contraceptives is not prevented by heparin administration before vessel isolation.
mesh_terms: D000818:Animals; D003276:Contraceptives, Oral; D011464:Epoprostenol / Q000096:biosynthesis*; D005260:Female; D006493:Heparin / Q000008:administration & dosage*; D011453:Prostaglandins / Q000096:biosynthesis*; D051381:Rats; D013997:Time Factors; D014682:Vena Cava, Inferior / Q000032:analysis*
chemical_list: D003276:Contraceptives, Oral; D011453:Prostaglandins; D006493:Heparin; D011464:Epoprostenol