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Footprinting of MB. (a) Product-ion (MS/MS) spectrum of the TFB-modified peptide 64-77 taken at a time determined from an extracted-ion chromatogram, EIC. The modification is on the N-terminal His, shown in red. (b) EIC of TFB-modified and unmodified peptide (64-77: HGTVVLTALGGILK) from MB.
