Table 4. Methionine-oxidized peptides of myosin isoform identified from three major porcine muscles by LC-MS/MS

Sequences	Muscle^a)	Observed	Mr (expt)	Mr (calc)	Ion score^b)
IEDEQALAMQLQK	SM	759.86	1517.70	1516.72	47
Myosin-1 (1098-1110)^c)		767.79	1533.57	1532.71	50
Myosin-4 (1096-1108)		767.79	1533.57	1532.71	50
LAQESTMDIENDKQQLDEK	SM	746.40	2236.18	2235.38	55
Myosin-1 (1065-1083)	SM	751.80	2252.37	2251.38	61
Myosin-4 (1063-1081)	LT	751.73	2252.15	2251.38	53
	PM	751.64	2251.90	2251.38	59
MQGTLEDQIISANPLLEAFGNAK	SM	821.47	2461.39	2460.76	40
Myosin-1 (215-237)	SM	826.71	2477.12	2476.76	48
Myosin-2 (215-237)	LT	826.65	2476.91	2476.76	56
Myosin-4 (215-237)	LT	826.65	2476.91	2476.76	56
MFLWMVTR	SM	542.94	1083.87	1083.37	40
Myosin-1 (438-445)		551.16	1100.30	1099.37	45
Myosin-2 (438-445)
Myosin-4 (438-445)
SAETEKEMANMKEEFEK	SM	678.28	2031.81	2031.22	59
Myosin-1 (846-862)		689.06	2064.15	2063.22	55
Myosin-4 (844-860)		689.06	2064.15	2063.22	55