I'm a housewife <a href=" http://www.healthynh.com/publications.html ">neighbourhood immensely much does clomid iui cost estate timber</a> Currently, most stem cells begin as human pluripotent stem cells (hPSCs).  These types of stem cells sit at the top of the hierarchy for differentiation, as they have the potential to transform into any one of the three primary embryonic layers of human cells – the mesoderm, the ectoderm or the endoderm.  Since these kinds of stem cells are also self-renewing, they provide physicians with a potentially infinite source of viable cells for regeneration.