cluster of differentiation 8 (CD8)

clus·ter of dif·fer·en·ti·a·tion 8 (CD8)

(klŭs'tĕr dif'ĕr-en-shē-ā'shŭn) Membrane glycoprotein found on subsets of T lymphocytes. CD8 is expressed on T-cytotoxic cells and T-suppressor cells.