cluster of differentiation 2 (CD2)

clus·ter of dif·fer·en·ti·a·tion 2 (CD2)

(klŭs'tĕr dif'ĕr-en-shē-ā'shŭn) A glycoprotein that is expressed on all peripheral T cells, large granular lymphocytes, and most, but not all, thymocytes. CD2 is involved in signal transduction and cell adhesion.