Figure 4. Relative proportions of major, minor, and novel salivary proteins in labial minor salivary gland secretion. *Histatin 1 was included based on the presence of the C-terminal 16-residue peptide found in all 3 sample preparations (A). MS/MS spectrum and sequence analysis of a tryptic peptide. The sequence of R.DPSQQELPR.L is indicative of the presence of "fatty acid synthase" (P49327). Matching band y-ion series are indicated in the upper right (B).