title: Biodegradable microsphere contraceptive system.
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D002214:Capsules; D003271:Contraceptive Agents, Female / Q000008:administration & dosage / Q000494:pharmacology*; D004343:Drug Implants; D004717:Endometrium / Q000187:drug effects; D005260:Female; D008855:Microscopy, Electron, Scanning; D009640:Norethindrone / Q000097:blood; D010215:Papio; D011108:Polymers / Q000494:pharmacology; D013997:Time Factors
chemical_list: D002214:Capsules; D003271:Contraceptive Agents, Female; D004343:Drug Implants; D011108:Polymers; D009640:Norethindrone