The Binding Activity of Human IL2RA with Anti-IL2RA Recombinant Antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized Human IL2RA (CSB-MP011649HU3) at 2 μg/mL can bind Anti-IL2RA recombinant antibody , the EC<sub>50</sub> is 2.463-3.353 ng/mL.