title: Handling chorionic villi for direct chromosome studies.
mesh_terms: D002824:Chorionic Villi / Q000648:ultrastructure*; D002871:Chromosome Banding / Q000379:methods*; D005260:Female; D006801:Humans; D010920:Placenta / Q000648:ultrastructure*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000379:methods