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M. mazei semi-tryptic peptide from MM1073 (MtaC2). Peptide 138–150, C*HVAEGDVHDIGK is incremented by 25-Da at its N-terminus, consistent with cyanylation. The sequence is common to segment 138–150 of methanol corrinoid proteins MM1648 (MtaC1) and MM1073 (MtaC2).
