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Negative-ion MALDI-TOF mass spectra of the 31 bp PCR products obtained from amplification with (A) the unlabeled dNTP precursors, (B) 100% 13C/15N-dATP, (C) both 100% 13C/15N-dATP and 13C/15N-dTTP. +K+ or 39Da indicate potassium adducts. UL or L designate to a unlabeled or labeled strain, respectively.
