In sandwich ELISAs, less than 6% cross-reactivity with recombinant human Dkk-1 and less than 0.1% cross-reactivity with recombinant mouse (rm) Dkk-2, rmDkk-3, and rmDkk-4 is observed. Reconstitute at 0.2 mg/mL in sterile PBS. DKK-1 is a member of the DKK