Immunogen sequence: WTALHPGAKK MTEKWEKNRD VTMFFQKISL GDCKMWLEEF LMYWEQMLDP TKPPSLAPGT TQPK. ULBP1 is the ligand for the NKG2D receptor, together with at least ULBP2 and ULBP3. ULBPs activate multiple signaling pathways in primary NK cells, resulting in t