Abstract Background The major histocompatibility complex (MHC) molecule plays a central role in controlling the adaptive immune response to infections. MHC class I molecules present peptides derived from intracellular proteins to cytotoxic T cells. whereas MHC class II molecules stimulate cellular and humoral immunity through presentation of extracellularly derived peptides to helper ... https://www.footballmediaservices.com/product-category/pipe-beveling-machine/