The T cell coreceptor CD8 is a cell-surface glycoprotein expressed either as a disulfide-linked homodimer of two CD8alpha monomers, or a heterodimer of CD8alpha and CD8beta. These receptors interact with ligands, such as major histocompatibility complex (MHC) class I, on the outside of the cell, with proteins inside the cell, such as the tyrosine kinase p56lck, and possibly with proteins on the same cell-surface (1). CD8 plays an important role in T cell development in the thymus and T cell activation in the periphery (2).
Related Pathway
Hematopoietic cell lineage
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