May act as receptor (By similarity). Negatively regulates TCR-mediated CD4(+) T cell proliferation and activation, possibly by binding an unknown ligand on the T cell surface (PubMed:26311901). Enhances Toll-like receptor-mediated production of pro-inflammatory cytokines by macrophages and neutrophils (By similarity). . This is the function of Ensembl gene identifier ENSG00000248385 (TARM1, T cell-interacting, activating receptor on myeloid cells 1).