Figure 5.
PCA of the MS data set acquired from the cell population of an islet of Langerhans. (A) Score plot projected onto PC 1 by the PC 2 plane, with a rainbow color scale indicating scores on PC 3 (warmer color = higher PC 3 score). PC1: 27.4% variance; PC2: 19.8% variance; and PC3: 15.2% variance. (B) Loading spectra for PCs. Blue: PC 1; black: PC 2; and red: PC 3. Peak annotations are 1: somatostatin-14; 2: insulin 1 A+B [M + 2H]2+; 3: insulin 2 C-peptide; 4: insulin 1 C-peptide; 5: glicentin-related polypeptide; 6: glucagon; 7: pancreatic hormone; 8: insulin 1 and 2 A+B chains.