May plays a role in triggering innate immune responses. Seems not play a role for any class I MHC antigens recognition.
Expressed mostly in tissues of the hematopoitic system, including bone marrow, spleen, lymph node and peripheral leukocytes. Among leukocytes, monocytes and neutrophils express the highest level. Expressed in CD14+ monocytes, but not in T-cells, B-cells or natural killer (NK) cells (at protein level).