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Effect of H and VA on the expression of HLA class-I antigens on cervical cancer cells. C33, CaSki and MS751 cells were incubated in the presence of H and VA and either HLA-A2 (A) or total HLA class-I (B) expression was determined by flow cytometry as indicated in materials and methods. The mean of 10 000 events is depicted in each cell treatment. Significant differences, * and ** were obtained in comparison to untreated cells (wt).
