Table II. Selected ECD fragmentation ions identified in S Phase H1.2SNP A18V N_α-ac.

Ion Type	Charge State	MS m/z	Theoretical m/z	Mass Error (ppm)
c16	1+	1519.7741	1519.7738	0.18
c16	2+	760.3909	760.3903	0.82
c18	2+	858.4520	858.4516	0.47
c19	2+	907.9858	907.9851	0.77
c20	2+	972.5338	972.5343	0.47
c21	2+	1036.5813	1036.5818	0.49
c21	3+	691.3907	691.3901	0.85
c22	2+	1100.6281	1100.6294	1.14
c22	3+	734.0890	734.0888	0.27
c23	2+	1136.1467	1136.1475	0.72
c23	3+	757.7677	757.7673	0.59
c24	3+	781.4465	781.4467	0.23
c25	2+	1235.7129	1235.7142	1.06
c25	3+	824.1451	824.1444	0.86