title: Comment: The midline.
authors.affiliation: Pediatrics (Medical Genetics), Pediatric Pathology, Human Genetics, Obstetrics and Gynecology, University of Utah School of Medicine, Salt Lake City, Utah.
authors.forename: John M
authors.initials: JM
authors.lastname: Opitz
mesh_terms: D000818:Animals; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology*; D006801:Humans; D010802:Phylogeny