Stem-cell scientists led by Dr. John Dick have discovered a completely new view of how human blood is made, upending dogma from the 1960s.

"Instead, through a series of experiments we have been able to finally resolve how different kinds of blood cells form quickly from the stem cell -- the most potent blood cell in the system -- and not further downstream as has been traditionally thought," says Dr. Dick, who holds a Canada Research Chair in Stem Cell Biology and is also Director of the Cancer Stem Cell Program at the Ontario Institute for Cancer Research...
http://www.sciencedaily.com/releases/2015/11/151105143819.htm