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Crystal structure (PDB ID 3NTP) of Pin1 (top left) showing the locations of C57 and C113, which are observed in non-oxidized (C57, yellow) and oxidized (C113, red) forms, respectively. Mass spectrum of intact Pin1 (top right) showing doubly and triply oxidized species as the most abundant. Zoomed-in section of a 193 nm UVPD mass spectrum (bottom) of the 22+ charge state species, deconvolved to singly protonated species. Apostrophe (’) indicates the neutral loss of water.
