Activity : 1. Measured by its binding ability in a functional ELISA. Immobilized Human IL23 Receptor hFc(Cat:13840-H02H) at 2 £gg/ml (100 £gl/well) can bind Mouse IL-23 His(Cat:CT028-M08H), the EC50?of Mouse IL-23 2. Measured by its ability to induce IL17 secretion by mouse splenocytes. The ED50 for this effect is 0.5-4 ng/mL.