Anti-human MHC Class I (HLA-A, HLA-B, HLA-C)-InVivo reacts with the human major histocompatibility complex (MHC) class I, HLA-A, B, and C. All human nucleated cell express MHC class I antigens associated with β2-microglobulin. MHC class I plays a central role in cell-mediated immune responses and tumor surveillance.