Increased antigen presentation of HeLa-Kb-B27 in rAd5-EAT2-infected cells. HeLa-Kb-B27 cells were either uninfected or infected with MOI of 1000 with rAd5-EAT2, rAd5-EAT2(R31Q) or rAd5-Null. At 24 hpi, cells were harvested and FACS analysis was performed. (A) Surface expression (MFI) of intact HLA-B27, measured by staining with ME1 antibody. (B) Surface expression of HLA-B, -A, -C, -E, -G, measured by staining with W6/32 antibody. Data are representative of four independent experiments with similar results. Samples were plated in quadruplicates. Bars represent mean ± SD. Statistical analysis was completed using a one way ANOVA with a Student–Newman–Keuls post-hoc test. P <0.05 was deemed a statistically significant difference. **P < 0.01, statistically significant from mock-treated cells.