The Binding Activity of Human ERBB2 with Anti-ERBB2 Recombinant Antibody. Activity: Measured by its binding ability in a functional ELISA. Immobilized Human ERBB2 (CSB-MP007763HU) at 2 μg/mL can bind Anti-ERBB2 recombinant antibody, the EC<sub>50</sub> is 2.455-3.565 ng/mL.