Leukocyte immunoglobulin-like receptor subfamily B member 3 (LILRB3)

May act as receptor for class I MHC antigens. Becomes activated upon coligation of LILRB3 and immune receptors, such as FCGR2B and the B-cell receptor.

Down-regulates antigen-induced B- cell activation by recruitment phosphatases to its immunoreceptor tyrosine-based inhibitor motifs (ITIM). .