Embryonic stem cells es cells or escs are pluripotent stem cells derived from the inner cell mass of a blastocyst an early stage pre implantation embryo 1 2 human embryos reach the blastocyst stage 4 5 days post fertilization at which time they consist of 50 150 cells. Human embryonic stem cells hescs are generated by transferring cells from a preimplantation stage embryo into a plastic laboratory culture dish that contains a nutrient broth known as culture medium the cells divide and spread over the surface of the dish. Stem cells are undifferentiated cells that are capable of dividing for long periods of time and can give rise to specialized cells under particular conditions embryonic stem cells are a particular type of stem cell derived from embryos according to us national institutes of health nih in humans . Human embryonic stem cells have also brought science to the threshold of discoveries that will prompt new ethical questions in japan scientists recently took an important step toward in vitro . Reprogramming somatic cells into pluripotent embryonic stem cells escs by somatic cell nuclear transfer scnt has been envisioned as an approach for generating patient matched nuclear transfer nt escs for studies of disease mechanisms and for developing specific therapies
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