Embryonic stem cells (ES cells) are stem cells derived from the inner cell mass of an early stage embryo known as a blastocyst. Human embryos reach the blastocyst stage 4-5 days post fertilization, at which time they consist of 50-150 cells. Stem cell technology may prove many more medical inventions.Dr.Evan Snyder, MD, Ph.D Harvard Medical school specialized in new born babies, he explains about embryonic stem cells" When sperm fertilizes egg which is the beginning of the organism this fertilized egg starts to divide into 2 cells and 4 cells and later it develops into a ball of cells, Some how these cell which look identical will give rise to many different kind of very diversified parts of the body, these cells are very flexible, we call these cells has stem cells, these cells have many possibilities it may go to brain to become brain cell or go to the spinal cord to become spinal cord cell or it needs to go to the heart to become a heart cell or go to the liver to become liver cells".
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