CD2 interacts with lymphocyte function-associated antigen CD58 (LFA-3) to mediate adhesion between T-cells and other cell types. CD2 is implicated in the triggering of T-cells, the cytoplasmic domain is implicated in the signaling function. Interacts with CD48 (By similarity). Interacts with CD58 (LFA-3) (By similarity). Interacts with CD2AP (By similarity). Interacts with PSTPIP1 (By similarity). Interacts with FCGR3A; this interaction modulates NK cell activation and cytotoxicity. Expressed in spleen and thymus.