Before stem cells, of whatever origin, can be used to treat patients, scientists will need to learn how to coax them to develop into the desired cell types, a major challenge. In the 12 October 2004 issue of Developmental Cell, researchers from the University of Chicago present the first rough road map, suggesting how to lead a hematopoietic stem cell down the narrowing path to becoming an antibody-producing B cell.
http://www.sciencedaily.com/releases/2004/10/041012084219.htm