National Institutes for Health website. http://stemcells.nih.gov/info/basics/pages/basics6.aspx many different things stem cells. possible applications stem cells Initial human clinical trials http://stemcells.nih.gov... National Institutes of Health caused by hematopoietic stem cells (HSCs) información therapies potential to treat diseases fixing broken hearts http://stemcells.nih.gov/info/basics/pages/basics6.aspx Initial human clinical trials roughly six months in total