Description: The monoclonal antibody 54 recognizes mouse Tim-4 (T cell, Ig, mucin). Unlike other Tim family members, Tim-4 is not expressed on T lymphocytes but rather found on antigen presenting cells such as lymphoid and myeloid DC’s and macrophages. Tim-4 has been shown to interact with Tim-1 thereby suggesting a role of Tim-4 in the balance of Th1/Th2 regulation. Additionally Tim-4 has been shown to be a receptor for phosphatidylserine and may play a role in engulfment of apoptotic cells. Expression is found on a subset of CD11c+ splenic cells.