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![Sandwich ELISA: CD21 Antibody Pair [HRP] [NBP2-79286] - This standard curve is only for demonstration purposes. A standard curve should be generated for each assay.](http://images.novusbio.com/fullsize/CD21-Antibody-Pair-[HRP]-Sandwich-ELISA-NBP2-79286-img0001.jpg "Sandwich ELISA: CD21 Antibody Pair [HRP] [NBP2-79286] - This standard curve is only for demonstration purposes. A standard curve should be generated for each assay.")