HLA Class I Histocompatibility Antigen, Alpha Chain E
Historically, the gene cluster on chromosome 6 that harbors the human leukocyte antigen (HLA) system was termed major histocompatibility complex (MHC), because their discovery was linked to experiments regarding tissue transplantations. It became later apparent that the HLA system is comprised of several molecule classes of which the HLA class I and HLA class II molecules are surface-expressed glycoproteins that present peptides of self or pathogenic origin to different T cell subtypes. This procedure termed MHC restriction sheds new light on T cell–mediated immunity and also elucidates the obstacle of organ rejection. The extensive influence of this...