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Putative formate dehydrogenase protein fragments and unique serine-containing tryptic peptides detected in membrane-enriched cell fractions from CBDB1, KB1, and SRNL cultures (a) and a representative MS-MS spectrum from uncharacterized Dehalococcoides in the SRNL culture (b). The molecular weight difference between product ions y15 and y14 is 87, demonstrating a serine residue in the corresponding sequence.
