The Binding Activity of Human MS4A1 with Anti-MS4A1 recombinant antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized Human MS4A1 (CSB-MP015007HU) at 5 μg/mL can bind Anti-MS4A1 recombinant antibody, the EC<sub>50</sub> is 6.959-19.70 ng/mL.