Complications in the assignment of 14 and 28 Da mass shift detected by mass spectrometry as in vivo methylation from endogenous proteins

Jung, S. Y., Li, Y., Wang, Y., Chan, Y., Zhao, I., & Qin, J. (2010). Complications in the assignment of 14 and 28 Da mass shift detected by mass spectrometry as in vivo methylation from endogenous proteins. Annual Review of Analytical Chemistry, 80(5), 1721–1729.