In direct ELISAs and Western blots, less than 1% cross-reactivity with recombinant mouse Plexin A1, A2, A3, recombinant human Plexin B1, B2, and D1 is observed. Reconstitute at 0.2 mg/mL in sterile PBS. Receptor for SEMA7A, for smallpox semaphorin A39R,