title: Malformations unique to the twinning process.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D000328:Adult; D001163:Arteriovenous Anastomosis / Q000002:abnormalities; D001724:Birth Weight; D004200:Diseases in Twins; D004487:Edema / Q000235:genetics; D005260:Female; D006330:Heart Defects, Congenital / Q000235:genetics; D006801:Humans; D017880:Limb Deformities, Congenital; D008297:Male; D008540:Meiosis; D009421:Nervous System Malformations; D010920:Placenta / Q000098:blood supply; D011086:Polycythemia / Q000235:genetics; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013476:Superfetation; D013723:Teratogens / Q000494:pharmacology; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic; D014463:Ultrasonography
chemical_list: D013723:Teratogens