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MALDI-TOF/MS spectrum of the cell-free extract of L. lactis NZ9000 (pInukdT). Modified NukA that had accumulated inside the cells was monitored by MALDI-TOF/MS. Each peak corresponds to a protonated, sodium adduct, potassium adduct, and sodium/potassium adduct at m/z 6332.6, 6354.2, 6374.6, and 6395.3, respectively.
