incubation of quiescent chinese-hamster fibroblasts ( ccl39 ) with alpha-thrombin , a potent mitogen for the cells , was found to stimulate the rapid phosphorylation of two 43,000-mr and two 41,000-mr proteins at tyrosine , threonine and/or serine , and two 63,000-mr proteins at serine .
C0016030
fibroblasts
C0007634
cells