This kit is for quantitating the recombinant Protein A ligands used in the Tosoh Bioscience TOYOPEARL® AF-rProtein A HC-650F (R40) or TOYOPEARL® AF-rProtein A-650F (R28) chromatographic resins. When using this assay for TOYOPEARL® AF-rProtein A-650F (R28) resin, an adjustment is necessary for assay calibration (see Specificity/Cross Reactivity section). It is for research and manufacturing use only and is not intended for diagnostic use in humans or animals. Please use Sample Diluent, Item No. I600, with these kits; also included in the kit.