( d ) finally , the studies on determining whether or not the c-kinase branch of the ca2+ messenger system might play a role in regulating the tonic phase of agonist-induced smooth muscle contraction revealed that the phorbol ester , pdbu , but not pma , induced mlc phosphorylation and contraction in a dose and time dependent manner .
C0031586
phorbol ester
C0039654
pma