we have compared the level of phosphotyrosyl phosphatase activity in lysates from normal human colon mucosal cells and human colon carcinoma cells and analyzed the effect of incubating these cells with sodium orthovanadate , an inhibitor of phosphotyrosyl phosphatase activity , on the relative abundance of acid-stable phosphotyrosine and on in vitro protein kinase activity of pp60c-src .
C0009368
colon
C0699790
colon carcinoma