Changes

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.

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.

In 2001 President [[George W. Bush|Bush]] allowed federal funding for research performed only on 60 strands of already existing stem cells. <ref>http://www.whitehouse.gov/news/releases/2001/08/20010809-2.html </ref>.

In 2001 President [[George W. Bush|Bush]] allowed [[federal funding]] for research performed only on 60 strands of already existing stem cells. <ref>http://www.whitehouse.gov/news/releases/2001/08/20010809-2.html </ref>.

==Controversy==

==Controversy==