the poly ( adp-ribose ) polymerase activity of wild-type mouse l cells and of balb/c-3t3 mouse fibroblasts remained relatively unchanged ( at approx . 400 nmol substrate utilized/mg dna per h ) in actively-growing cells incubated at 34 degrees c or at 38.5 degrees c for at least 72 h .
C0016030
fibroblasts
C0007634
cells