What are the types of stem cells(continued)

Here is a current list of the sources of stem cells based on source of collection:

1.      Embryonic stem cells - are harvested from the inner cell mass of the blastocyst seven to ten days after fertilization.

2.      Fetal stem cells - are taken from the germline tissues that will make up the gonads of aborted fetuses.

3.      Umbilical cord stem cells - Umbilical cord blood contains stem cells similar to those found in bone marrow.

4.      Placenta derived stem cells - up to ten times as many stem cells can be harvested from a placenta as from cord blood.

5.      Adult stem cells - Many adult tissues contain stem cells that can be isolated.