Probable adapter protein and signal transducer that links members of the tumor necrosis factor receptor family to different signaling pathways by association with the receptor cytoplasmic domain and kinases. The MATH/TRAF domain binds to receptor cytoplasmic domains. Belongs to the TNF receptor-associated factor family. A subfamily. The gene for this protein is duplicated in strains AX3 and AX4. These strains contain a duplication of a segment of 750 kb of chromosome 2 compared to the corresponding sequence in strain AX2.