Table 3.

Mass peaks frequently displaying mass shifts detected by whole-cell MALDI-TOF MS of Salmonella enterica subsp. enterica serovars^a

Tentative protein identity	Observed mass (Da)	Predicted mass (Da)	Amino acid substitution(s) compared to serovar Typhimurium sequence	Example(s) of prevalent serovars containing signal
Uncharacterized protein YhfG	6,799	6,799.8 (M+H)+		Typhimurium, Virchow
	6,771	6,771.8 (M+H)+	D→S	Enteritidis, Hadar
	6,718	6,718.7 (M+H)+	R→C/V→A	Infantis
	6,757	NA	NA	Goldcoast
NA	8,418	NA	NA	Typhimurium, Virchow, Infantis,
	8,445	NA	NA	Hadar
Putative inner membrane protein STM0348	8,686	8,687.3 (M+H)+		Typhimurium, Enteritidis
	8,699	8,699.3 (M+H)+	M→L/A→T	Virchow, Infantis, Hadar
NA	9,404			Typhimurium, Virchow, Hadar
	9,390			Enteritidis
	9,374			Infantis
Ribosomal protein RL21	11,565	11,565.4 (M+H)+	I→V
	11,579	11,578.4 (M+H)+		Typhimurium, Enteritidis,
				Virchow, Hadar, Infantis
Putative inner membrane protein YgaM	11,848	11,848.4 (M+H)+		Typhimurium, Virchow, Hadar
	11,857	11,857.5 (M+H)+	Q→H	Enteritidis, Infantis
Ribosomal protein RS7	17,461	17,460.2 (M-M+H)+		Typhimurium, Virchow, Infantis, Hadar
	17,474	17,474.2 (M-M+H)+	D→E
Putative uncharacterized protein YciF	18,654	18,653.2 (M+H)+		Typhimurium, Virchow, Hadar
	18,644	18,643.2 (M+H)+	P→S	Enteritidis
	18,635	18,634.2 (M+H)+	R→H	Infantis
Superoxide dismutase (Mn)	22,949	22,948.9 (M-M+H)+		Typhimurium
	23,012	23,010.9 (M-M+H)+	S→D/L→F	Enteritidis
	29,979	22,976.9 (M-M+H)+	S→D/N	Infantis, Virchow, Hadar

^aNA, not assigned.