The Binding Activity of Human C5AR1-VLPs with Anti-C5AR1 recombinant Antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized Human C5AR1 (CSB-MP003996HU) at 10 μg/mL can bind Anti-C5AR1 recombinant antibody, the EC<sub>50</sub> is 1.239-3.760 ng/mL.