HeLa cells were incubated for 30 min in absence or in the presence of MT or MUC-G at 40 μg/ml. After washings, the cell extracts were analyzed by western blotting, using antibody directed to phosphorylated tyrosine proteins. Note the increased phosphorylation levels of protein bands in cells that interacted with MT or with MUC-G (black arrows). (TIF)</p