In direct ELISAs, less than 2% cross-reactivity with recombinant mouse (rm) Frizzled-2, rmFrizzled-3, rmFrizzled-4, rmFrizzled-6, rmFrizzled-7, and rmFrizzled-8 is observed. Reconstitute at 0.2 mg/mL in sterile PBS. Members of the 'frizzled' gene family