These cells have the potential for unlimited expansion with the retention of normal karyotype and the ability to generate cells of all three germ layers. Because of this, they have been proposed for use in for drug screening and toxicity and as a tool to study cellular and developmental biology.
Hematopoietic stem cells
These are found in a variety of tissues through development. Hematopoietic cells are able to differentiate into all terminally differentiated cells found in the blood.