Phosphatidylserine receptor that plays an important functional role in regulatory B-cells homeostasis including generation, expansion and suppressor functions (By similarity). As P-selectin/SELPLG ligand, plays a specialized role in activated but not naive T-cell trafficking during inflammatory responses. Controls thereby T-cell accumulation in the inflamed central nervous system (CNS) and the induction of autoimmune disease (By similarity). Regulates also expression of various anti-inflammatory cytokines and co-inhibitory ligands including IL10. Acts as regulator of T-cell proliferation (By similarity). May play a role in kidney injury and repair (By similarity). Interacts with STAM. Interacts with SELPLG. Experimental confirmation may be lacking for some isoforms. Belongs to the immunoglobulin superfamily. TIM family.