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(a) WS chromatogram and (b) WI chromatogram for 104pQDDHGYSIR112 from pig. (c) WS Sheep. (d) WI Sheep. Lower case “p” indicates the pyroglutamate that forms during tryptic digestion of N-terminal glutamine residues. Isomers were confirmed by MS/MS analysis and are labeled with percent abundance.
