title: Introduction: Johannes Holtfreter, pioneer in experimental embryology.
authors.affiliation: Department of Biology, Washington University, St. Louis, Missouri 63110, USA.
authors.forename: V
authors.initials: V
authors.lastname: Hamburger
mesh_terms: D001921:Brain / Q000254:growth & development; D004626:Embryology; D004627:Embryonic Induction; D005775:Gastrula; D049673:History, 20th Century