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Acid-catalyzed oxygen-18 labeling of peptides.
Niles R, Witkowska HE, Allen S, Hall SC, Fisher SJ, Hardt M. Niles R, et al. Anal Chem. 2009 Apr 1;81(7):2804-9. doi: 10.1021/ac802484d. Anal Chem. 2009. PMID: 19243188 Free PMC article.