Human Leukocyte HLA-B7 and HLA-B27 Antigen Typing Among Healthy Adults - Paperbackby Francis Millinga (Author), Said Aboud (Author), Erasto Mbugi (Author) The human leukocyte antigens are genetically inherited proteins present on the surface of the cells of the immune system. Cells of the immune system recognize antigens only when presented to them next to an MHC self molecule. Three main types of HLA Class I namely, HLA A, HLA B and HLA C they are expressed by most human cells. Class I HLAs are involved in discriminating and