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A, MALDI-TOF MS of peptide mixture from in-gel tryptic digestion of high-pI α-glucosidase (cv Alexis). Marked signals match the deduced α-glucosidase sequence (▪, cv Morex; Δ, cv Igri). B, Peptides are marked as in A. Measured and calculated molecular masses are given as protonated mono-isotopic masses.
