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ER-MP42 recognizes murine MHC class I molecules on the surface of cells of the following haplotypes: H-2Fv, H-2Dd, H-2k,q,s. Weaker reactivity is found in mice of the following haplotypes: H-2p,r,w7,w22. MHC class I molecules of other haplotypes are not recognized by ER-MP42. There is no cross-reactivity with human MHC class I molecules.
Like their mammalian counterparts, avian MHC Class I molecules, also known as B-F antigens, consist of a highly polymorphic alpha-chain noncovalently bound to the invariant beta2-microglobulin subunit. MHC Class I molecules are expressed on most nucleated cells where they present endogenously synthesized antigenic peptides to CD8+ T lymphocytes, which are usually cytotoxic T cells. The monoclonal antibody F21-2 also reacts with turkey MHC Class I.
HLA and MHC antibodies play a significant role in Immunopeptidomics, facilitating the identification and characterization of neoantigens through high-performance liquid chromatography coupled to tandem Mass Spectrometry.
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