Specialized stem cells that are committed to give rise to cells that have a particular function; examples are myoblasts; myeloid progenitor cells; and skin stem cells. (stem cells: A Primer [internet]. Bethesda (MD): National Institutes of health (US); 2000 May [cited 2002 Apr 5]. Available from: http://www.nih.gov/news/stemcell/primer.htm)