title: Prenatal diagnosis before implantation: opportunities and problems.
mesh_terms: D000818:Animals; D001706:Biopsy / Q000379:methods; D001755:Blastocyst / Q000473:pathology; D002478:Cells, Cultured; D002999:Clone Cells / Q000473:pathology; D010064:Embryo Implantation; D004622:Embryo, Mammalian; D047108:Embryonic Development; D005260:Female; D006801:Humans; D053652:Nuclear Transfer Techniques; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D013045:Species Specificity