Assertion: antibody's affinity | /r/HasProperty | determined by spr
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text: Some of the antibodies, whose affinities have been determined by SPR are human epidermal growth factor (hEGF) monoclonal and polyclonal antibodies, and therapeutic monoclonal antibodies against proprotein convertase subtilisin/kexin type 9 (PCSK9), progranulin (PGRN), and fatty acid binding protein (FABP4) in human serum at its endogenous concentrations .