Fig. 3

Colorectal cancer cell lines express low surface B7-H1 at baseline. a Representative histograms and b quantification of mean fluorescent intensity (MFI) for baseline B7-H1 surface expression compared to the isotype control in HCT116 p53^+/+, HCT116 p53^−/−, SW480 and HT29 colorectal cancer cell lines (n = 3). The SW480 cells carry R273H and P309S homozygous mutations at p53 and the HT29 have a homozygous R273H mutation