The best media available is made from fetal calf serum or horse serum, and you know, that's sort of a nonstarter. (scientificamerican.com)
A team of developmental biologists led by Hans Schöler and Karen Hübner at the University of Pennsylvania placed densely packed clusters of stem cells from mouse embryos in a petri dish, using fetal calf serum as a growth medium and adding a gene protein that turns green when germ cells form. (discovermagazine.com)
In the early 1980s, Eaves, the founding director of the British Columbia Cancer Agency's Terry Fox Laboratory, started buying up the best fetal calf serum by the bucket - full, bringing it to his lab, and rigorously testing it for its ability to support the growth of hematopoietic stem cells. (the-scientist.com)