membrane proteins were also susceptible to phosphorylation by endogenous kinase ( s ) , with polypeptides of apparent molecular weights equal to 160 x 10 ( 3 ) , 135 x 10 ( 3 ) , 114 x 10 ( 3 ) , and 58 x 10 ( 3 ) as the major targets .
C0031715
phosphorylation
C0031727
kinase