In direct ELISAs and Western blots, less than 2% cross-reactivity with recombinant mouse (rm) Frizzled-1, rmFrizzled-2, rmFrizzled-3, rmFrizzled-4, recombinant human Frizzled-5, rmFrizzled-6, rmFrizzled-7, rmFrizzled-8, and rmFrizzled-9 is observed. Reco