What is Embryonic stem cell Embryonic stem cells(es cells)are e pluripotent stem cells derived from the inner cell mass of a endometrium blastocyst, an nner cell mass (embryoblast early-stage pre trophoblast implantation blastocyst cavity embryo (blastocoele) Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage pre￾implantation embryo