title: Comments on the neural crest and parasitic conjoined twins.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D006801:Humans; D009432:Neural Crest / Q000033:anatomy & histology*; D014428:Twins, Conjoined / Q000473:pathology*; D014630:Vagus Nerve / Q000002:abnormalities