May be involved in thymocyte signaling. Interacts with CD7. Detected at the highest levels in peripheral blood leukocytes and breast cancer cell lines. Found in leukocytes of the myeloid lineage, with the strongest expression observed in granulocytes and no detectable expression in lymphocytes. Expressed in thymic epithelial cells and fibroblasts. By IFNG/IFN-gamma (at protein level). Belongs to the SECTM family.