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(a) Electrospray ionization (ESI) mass spectrum of a tryptic peptide CAQCHTVEK containing two benzeneselenol tags, (b) 266 nm UVPD mass spectrum of C*AQC*HTVEK (2+), and (c) UVPDnLossCID spectrum. The asterisks represent incorporation of benzeneselenol tag. Reproduced with permission from ref 134. Copyright 2016 American Chemical Society.
