Triggers NCR3-dependent natural killer cell activation. Monomer. Interacts specifically with NCR3, but not with other natural killer cell-activating receptors, including NCR1, NCR2 and KLRK1. Not detected in any normal tissue tested. Expressed at the surface of several tumor cell lines including T and B-lymphomas, myeloid leukemias, melanomas, carcinomas and large T SV40 antigen-transformed cells (at protein level). The C-terminal part is similar to retroviral Gag protein. This putative protein seems to be the result of a fusion between an Ig-like domain-containing protein and a ERV. Extended N-terminus.