Human class II major histocompatibility complex (MHC) products are essential initiators of cellular immune responses. Their cell surface expression demonstrates aspects of tissue-restriction, inducibility, differentiation-dependence, and coordinate regulation indicative of complex molecular controls mediated primarily at the level of transcription (1). There are three major isotypes of human class II MHC molecules; HLA-DR, HLA-DP, and HLA-DQ, each of which consists of an alpha and beta chain (2). HLA-DR alpha is a polymorphic cell surface glycoprotein that is crucial for the cellular interaction in immune response. Class II molecules have limited tissue distribution and are predominantly expressed on B lymphocytes and macrophage and present peptides derived from extracellular proteins to T cells (3).
Hematopoietic cell lineage
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