The Binding Activity of Human DDR1 with Anti-DDR1 Recombinant Antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized Human DDR1(CSB-MP006595HU) at 2 μg/mL can bind Anti-DDR1 recombinant antibody, the EC<sub>50</sub> is 2.824-3.810 ng/mL.