Human Prostatic Acid Phosphatase/ACPP ELISA Standard Curve. Recombinant Human Prostatic Acid Phosphatase/ACPP protein was serially diluted 2-fold and captured by Mouse Anti-Human Prostatic Acid Phosphatase/ACPP Monoclonal Antibody (Catalog # MAB62401) coated on a Clear Polystyrene Microplate (Catalog # DY990). Sheep Anti-Human Prostatic Acid Phosphatase/ACPP Antigen Affinity-purified Polyclonal Antibody (Catalog # AF6240) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (Catalog # DY998) followed by Substrate Solution (Catalog # DY999) and stopping the enzymatic reaction with Stop Solution (Catalog # DY994).