the tryptic phosphopeptide map of pp17-20 ( phosphorylated in vivo ) in the transformed cells was similar to that of pp17-20 in pma-treated hl-60 cells but not to that induced by camp-pk , suggesting that the process activated by pma which leads to phosphorylation of pp17-20 resembles an intrinsic cellular process which is enhanced in certain malignant cells .
C0007634
cells
C0007613
cellular process