. Author manuscript; available in PMC: 2010 Aug 13.

Published in final edited form as: J Proteome Res. 2009 Feb;8(2):900–906. doi: 10.1021/pr8005155

Table 2.

Known and Previously Undescribed Mass Shifts Identified in Yeast Core Histones

residue	histone H3	histone H4	histone H2B
Known Mass Shifts
Lys	+14, +28, +42, 56, +70	+14, +42, +70	+14, +28, +42, +70
Arg		+14
Undescribed Mass Shifts
Lys	+98, −19	−19	−19
Arg		+53, +74
Asn		−2	+1^a
Ser	+83, +96^a	+12, +26, +68^a, +81, −2^a	+174, +198
Glu	+28^a, +42	+28^a, +74	+28^a
Asp		+42
Gln	+1^a	+1^a

This mass shift may represent a previously documented PTM (http://www.unimod.org).