What Is Trophoblast? 21 March 2016 Last month saw the publication of What Is Trophoblast? A Combination of Criteria Define HumanFirst-Trimester Trophoblast. Controversy surrounds reports describing the derivation of human trophoblast cells from placentas and embryonic stem cells (ESC)…this study identifies a robust panel, including both protein and non-protein-coding markers. Many CTR members have contributed to this paper including Ashley Moffett, Cheryl Lee, Myriam Hemberger, Lucy Gardner and Margherita Turco.