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Decreasing variability of the relative antigen density on HLA class I SAB of one vendor comparing an early and the most current lot. Relative antigen density was assessed by the monoclonal antibody clone W6/32 which binds a conformational epitope carried by all HLA-A, -B and -C native antigens. Variability of antigen density could be significantly reduced from an early (LAB-Screen lot#003) to a current lot (lot#007). HLA-C antigen density still reveals the highest variability.
