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Mass spectra of CDG (m/z =195.0) and dAdo (m/z =252.1) isolated from turnover of QueE with unlabeled or various site-specifically deuterated CPH4 substrates. An additional experiment was carried out with unlabeled substrate in D2O to determine if reductively cleaved SAM can be quenched by solvent or a solvent exchangeable site (see text).
