... can grow into a number of different cell types. For example, stem cells from bone marrow can form red blood cells, white blood cells, and platelets. There are skin cells, which gives rise to different types of skin cells, etc. Stem cells can be extracted from adults, children, and embryos. Embryonic stem cells are harvested from early human embryos. The embryos usually come from in-vitro fertilisation (IVF) clinics and are left over from infertility treatments. People arguing against embryonic stem cell research claim that other methods of harvesting stem cells where embryos are not destroyed can be just as effective at producing stem cells, or at least should be fully explored as an option first. These other methods include harvesting stem cells from cord blood taken from the umbilical cords of newborns and from bone marrow and other adult tissue. The embryonic stem cells are capable of using their genetic ...

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