Fig. 3From: Block-based characterization of protease specificity from substrate sequence profileScatter plot of principal component analysis from PC1versus PC2. The selected data is grouped into four types according to the MEROPS database, including aspartic, cysteine, metallo and serine. Coloring according to catalytic types, aspartic protease: blue; cysteine protease: red; metallo protease: green; serine protease: pinkBack to article page