Infection of the DOX+ MUC1-YF cells with E. coli inv showed a 30% reduction in the number of infected cells for the subset of MUC1-YF expressing cells compared to DOX− MUC1-YF cells (Fig. 4D and E), suggesting that tyrosine residues in the MUC1 CT play a role in ITGB1-mediated bacterial uptake. Here, MUC1 is linked to infection.