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Jung SY, Li Y, Wang Y, Chen Y, Zhao Y, Qin J. Complications in the assignment of 14 and 28 Da mass shift detected by mass spectrometry as in vivo methylation from endogenous proteins. Anal Chem. 2008 Mar 01;80(5):1721–9. PMID: 18247584; PMCID: PMC2920732. |