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(A) Coomassie blue staining SDS-PAGE of TAP purification. Both input and elute samples were analyzed. A band at 25 kDa was evident in tap:cbpA but not the tap control lane (arrow indicated) and identified as VicR by LC/MS/MS. (B) CabPA not CabPB bound to VicR as determined by a pull-down assay. Recombinant VicR could be pulled down by recombinant CabPA, not CabPB.
