"Calf serum" refers to the liquid part of blood that comes from young cows. It is commonly used in scientific research and medical laboratories to grow and study cells.
All staining was done at room temperature in FACS Wash Buffer (1 mM EDTA, 2.5 % fetal calf serum in PBS) and all antibodies were from BD Biosciences unless otherwise noted. (journals.plos.org)
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)
But Braude says cells that have never touched the mouse «feeder» cells or calf serum typically used to nourish human embryonic stem - cell lines are the safest source of cells for clinical trials. (scientificamerican.com)