Animal Antibodies Cattle Cell Division Fetal Blood Fetal calf serum Human Human peripheral blood mononuclear cells Insulin-Like Growth Factor I Insulin-like growth factor-1 (IGF-1) Lymphocyte Activation Mitogenic response Phytohemagglutinins Receptors, Cell Surface Receptors, Somatomedin Recombinant Proteins Somatomedins Stimulation, Chemical Support, Non-U.S. Gov't T-Lymphocytes cell culture growth factor human human cell insulin mitogenic agent normal human peripheral lymphocyte phytohemagglutinin priority journal