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Weis DD, Wales TE, Engen JR, Hotchko M, Ten Eyck LF.Weis DD, et al. Among authors: engen jr.J Am Soc Mass Spectrom. 2006 Nov;17(11):1498-1509. doi: 10.1016/j.jasms.2006.05.014. Epub 2006 Jul 27.J Am Soc Mass Spectrom. 2006.PMID: 16875839Free article.