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XIC and CID spectrum supporting the assignment of the CH1 domain disulfide bond. (A) XIC of the CH1 domain tryptic dipeptide at m/z 1130 (7+). The insert shows the full mass spectrum at 53.3 min. (B) CID spectrum of the 1130.86 ion (7+), supporting the assignment of the CH1 domain disulfide bond. Product ions (b/y) that contain the disulfide bond are labeled in red; product ions that do not contain the disulfide bond are labeled in green.
