Also known as reprogrammed stem cells, iPSCs are derived from somatic cells taken from adults, and offer researchers a way to examine the development of diseases.

FORBES: Aberrations Pose A Challenge for Reprogramming Stem Cells

Instead, they want to use somatic cell nuclear transfer, the same process used to clone Dolly the sheep in 1997, to create embryonic stem cells.

FORBES: Cloning's High Cost