The Binding Activity of CCR4 with Anti-CCR4 Recombinant Antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized CCR4 (CSB-MP004843HU) at 10 μg/mL can bind Anti-CCR4 Recombinant Antibody, the EC<sub>50</sub> is 362.3-630.8 ng/mL.