SCNT requires a large number of eggs and produces very few stem cell lines. (lozierinstitute.org)
In an article published in the Oct. 11, 2007 issue of Cell Stem Cell, the researchers show that in older flies a steep decline in the growth factor unpaired (upd), which is necessary to maintain stem cells, results in fewer stem cells in the testis of the fruit fly Drosophila. (sciencedaily.com)
«Until now, scientists had believed that in the normal state, very few stem cells — only about ten — are actively involved in blood formation.» (sciencedaily.com)