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This ELISA incorporates some improvements over the earlier kits and is designed to better detect the newer, unnatural constructs of Protein A such as the MabSelect SuReTM ligand sold by GE Healthcare. If you are using a recombinant form of Protein A with very significant structural differences from natural Protein A such as MabSelect SuReTM you should use the Catalog #F400 kit. If you are evaluating our Protein A assays for the first time, we recommend using this kit, since it offers other robustness and procedural advantages over the older kits. The LOD is ~50pg/mL.
