Effect of H.pylori on expression of MUC1 and MUC5AC in KATO III gastric epithelial cells in vitro. KATO III cells were incubated with or with out H.pylori, and cell lysates were subjected to Western analysis. Content of MUC1 antigen, detected with monoclonal antibody HMFG2, and of MUC5AC antigen, detected with monoclonal antibody CLH2, is expressed as percentage of untreated cells.