Relative levels of proSAAS-derived peptides in fed and fasted mice.

Abbreviations: Theor. Mass, theoretical monoisotopic mass of the peptide without isotopic tags or protons; n, number of runs in which the peptide was detected; Cont A/B, the relative level of peptide in two distinct groups of mice fed ad libitum; 1 d fast/Cont, the relative level of peptide in mice fasted for 1 day, relative to the level in control group B; 2 d fast/Cont, the relative level of peptide in mice fasted for 2 days, relative to control group B; Avg ± SD, average ratio of the 2–4 replicates with error range equal to the standard deviation. Most peptide sequences listed in column 2 were identified using MS/MS sequence information, in addition to several other criteria (mass within 0.005% of a known peptide, and the correct number of isotopic tags incorporated and charge state based on amino acid composition; see Materials and Methods) . Peptides surrounded by parentheses are tentatively identified by matches to known peptides.