摘要
Establishment and Organization of Germ Layers in the Gastrulating Mouse Embryo P. P. L. Tam, P. P. L. Tam The Children's Medical Research Foundation, PO Box 61, Camperdown, New South Wales 2050, AustraliaSearch for more papers by this authorR. S. P. Beddington, R. S. P. Beddington RAFRC Centre for Genome Research, Thc Old ABRO Building, King's Building, West Mains Road, Edinburgh EH9 3JQ, UKSearch for more papers by this author P. P. L. Tam, P. P. L. Tam The Children's Medical Research Foundation, PO Box 61, Camperdown, New South Wales 2050, AustraliaSearch for more papers by this authorR. S. P. Beddington, R. S. P. Beddington RAFRC Centre for Genome Research, Thc Old ABRO Building, King's Building, West Mains Road, Edinburgh EH9 3JQ, UKSearch for more papers by this author Book Editor(s):Derek J. Chadwick, Derek J. ChadwickSearch for more papers by this authorJoan Marsh, Joan MarshSearch for more papers by this author First published: 28 September 2007 https://doi.org/10.1002/9780470514221.ch3Citations: 9Book Series:Novartis Foundation Symposia AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary By following the distribution of wheat germ agglutinin–gold-labelled cells in primitive streak stage embryos, we obtained direct evidence for a continuous recruitment of the embryonic ectoderm cells to the definitive endoderm and to the embryonic and extraembryonic mesoderm during gastrulation. The majority of the definitive endodermal cells ingressed through the anterior end of the primitive streak and were incorporated initially into the midline endoderm at the archenteron, but a small population of endodermal cells may he recruited by direct delamination from the embryonic ectoderm. The pre-existing visceral embryonic endoderm was progressively replaced, but not totally, by the newly recruited population which colonized the embryonic foregut and the notochord. The developmental fate of the recruited endoderm and that of cells in the embryonic ectoderm and the mesoderm of late primitive streak stage embryos indicate that concomitant with the establishment of the germ layers, an orderly allocation of prospective fetal tissues to specific parts of the body occurs simultaneously in all three germ layers. References Batten BE, Haar JL 1979 Fine structural differentiation of germ layers in the mouse at the time of mesoderm formation. Anat Rec 194: 125–142 10.1002/ar.1091940109 CASPubMedWeb of Science®Google Scholar Beddington RSP 1981 An autoradiographic analysis of the potency of embryonic ectoderm in the 8th day postimplantation mouse embryo. 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Development 99: 109–126 10.1242/dev.99.1.109 CASPubMedWeb of Science®Google Scholar Citing Literature Ciba Foundation Symposium 165 ‐ Postimplantation Development in the Mouse: Postimplantation Development in the Mouse: Ciba Foundation Symposium 165 ReferencesRelatedInformation