Embryonic stem cells

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Embryonic stem cells are taken from the inner part of a young embryo, also known as a blastocyst. An embryo reaches the blastocyst stage about 4-5 days after fertilization. At that point they contain about 50-150 cells.

Embryonic stem cells can differentiate into the three "germ layers": ectoderm, endoderm and mesoderm. The 220 types of cells in humans are all based on these germ layers. Some scientists have shown effectively that embryonic stem cells have greater differentiation potential, and divide into greater numbers, than adult stem cells can.

Pro-life conservatives consider taking stem cells from human embryos, as tantamount to abortion, which they believe to be a hideous and evil practice. President Bush was pressured by Liberal Scientists into funding stem cell research[1].

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