Table 1.

Peptide sequences, labeling and MS/MS transitions monitored in the LC-MS/MS experiment. All peptides were synthesized in unlabeled and labeled forms by incorporation of a single ¹³C₆¹⁵N-leucine at the positions noted by bold underlined type in the Table.

Peptide	Formulation	Designation	Sequence	Transition m/z
Proteotypic	Unlabeled	Proteotypic	SASLHLPK	426.8 → 694.4
	Labeled	Proteotypic*	SASLHLPK	429.5 → 700.2
Wild Type Z	Unlabeled	WT-Z	AVLTIDEK	444.8 → 718.4
	Labeled	WT-Z*	AVLTIDEK	448.4 → 725.5
Mutant Z	Unlabeled	Mu-Z	AVLTIDKK	444.3 → 717.5
	Labeled	Mu-Z*	AVLTIDKK	447.5 → 723.4
Wild Type S	Unlabeled	WT-S	LQHLENELTHDIITK	602.0 → 781.9
	Labeled	WT-S*	LQHLENELTHDIITK	604.7 → 785.7
Mutant S	Unlabeled	Mu-S	LQHLVNELTHDIITK	592.0 → 766.9
	Labeled	Mu-S*	LQHLVNELTHDIITK	594.5 → 770.5