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GC-MS traces of hydrolyzed and derivatized (a) isoAsp, (b) MeLan, and (c) Lan residues from OlvA(BCSA)GluC. Traces of the co-injection of the hydrolyzed and derivatized OlvA(BCSA)GluC with synthetic standards are indicated in broken lines. A small amount of epimerization occurs for Lan as previously reported.45,46
