Where do stem cells come from?

Embryonic stem cells are from the inner cell mass of a blastocyst, which is a microscopic hollow ball of about 150 cells made up of an outer layer of cells that would form the placenta, a fluid filled cavity, and an inner cell mass containing cells that would form the embryo. Scientists isolate stem cells from embryos donated with informed consent of couples who have undergone in vitro fertilization (IVF). These embryos are no longer needed by the donor and would otherwise be discarded.

Adult stem cells can be found in small numbers in most of the tissues of the body. For example, blood stem cells are found in the bone marrow. But adult stem cells have not yet been found in some organs, for example the pancreas.

Adult stem cells can also be obtained from other sources, for example, the umbilical cord of a newborn baby is a source of blood stem cells. Recently stem cells have also discovered in amniotic fluid, but research on these cells is at a very early stage. Since late 2007, ... more.

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