Figure 2.

Score (A) and loading (B) plots of the first and second principal components (PC) after principal component analysis (PCA) based on the general aminopeptidase type N (PepN), proline iminopeptidase (PepI), X-prolyl dipeptidyl aminopeptidase (PepX), endopeptidase (PepO), and prolyl endopeptidase (PepP) activities of the cytoplasmic extracts of the 131 Bacillus, lactobacilli, and Weissella strains. PepN, PepI, PepX, and PepP were measured using Leu-p-nitroanilides (p-NA), Pro-p-NA, Gly-Pro-p-NA, Z-Gly-Gly-Leu-p-NA, and Z-Gly-Pro-4-nitroanilide substrates, respectively. All strains are reported in the plot by circles and the strain code was reported only for the selected strains.