In Western blots, no cross-reactivity with recombinant mouse (rm) B7-1, rmB7-2, rmB7-H1, rmB7-H2, rmB7-H3, recombinant human (rh) B7-H3b, rhB7-H4, or rmPD-L2 is observed. Reconstitute at 0.5 mg/mL in sterile PBS. B7-H4 (B7x, VTCN1) a costimulatory protei