AdvertisementAdvance In Human Embryo Research Rekindles Ethical DebateMay 04, 2016Rob SteinfacebookEmailMolecular markers show structures and cell types within a human embryo, shown here 12 days after fertilization. The epiblast, for example, appears in green. (Gist Croft, Alessia Deglincerti, and Ali H. Brivanlou/The Rockefeller University)
