title: A presomite human embryo (Shaw) with primitive streak and chorda canal, with special reference to the development of the vascular system.
authors.affiliation: Department of Anatomy, St Bartholomew's Hospital Medical College.
authors.forename: R J
authors.initials: RJ
authors.lastname: Gladstone
authors.forename: W J
authors.initials: WJ
authors.lastname: Hamilton