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Specific peaks for three serovars. (A) Mass peak at 3018 ± 1 m/z presents in serovar Enteritidis reference strains, (B) mass peak at 6037 ± 1 m/z presents in serovar Enteritidis strains, (C) mass peak at 7184 ± 1 m/z presents in serovar Typhimurium strains, and (D) mass peak at 4925 ± 1 m/z presents in serovar Thompson.
