How many human embryonic stem cell lines are there?
The available number of human embryonic stem cell lines is a matter of some debate. Originally, it was stated that there were at least 60 lines. However, most of those were not adequately characterized and only a minority (8 to 10) are currently widely accepted as true human embryonic stem cells. Detailed information on the cell lines that are available through the National Institutes of Health Human Stem Cell Registry can be found at http://stemcells.nih.gov.
