Table 3.

A subset of tryptic peptides from glyceraldehyde-3-phosphate dehydrogenase C subunit (At3g04120) that were identified by mass spectrometry and subsequent database search (¹⁴N-search, see methods for details). For each peptide the expected mass difference was calculated based on the measured mass to charge ratio (MCR). Asterisks mark those peptides that have also been identified in the database search with ¹⁵N as fixed modification (¹⁵N-search, see Methods for details)

Sequence	measured mass 14N	MCR 14N [Th]	Charge	calculated mass difference	calculated mass 15N	MCR 15N [Th]
AASFNIIPSSTGAAK	1434.42	718.22	2	16.95	1451.37	726.69
DAPMFVVGVNEHEYK	1733.42	867.72	2	18.94	1752.36	877.18
FGIVEGLMTTVHSITATQK *	2033.69	1017.85	2	18.94	2052.63	1027.32
GILGYTEDDVVSTDFVGDNR	2170.55	1086.28	2	23.93	2194.48	1098.24
LVSWYDNEWGYSSR	1760.47	881.24	2	19.94	1780.41	891.20
SDLDIVSNASCTTNCLAPLAK	2248.71	1125.36	2	23.93	2272.64	1137.32
VPTVDVSVVDLTVR *	1497.55	749.78	2	16.95	1514.50	758.25
YDSVHGQWK	1118.39	560.20	2	13.96	1132.35	567.17