Protease expression by microorganisms and its relevance to crucial physiological/pathological events

Figure 5 Classification of proteases. Gray circles represent amino acids and red circles indicate the amino acid sequence that is bound to the proteolytic enzyme. Yellow arrows point to the site of cleavage. The blue arrows indicate the classification of carboxypeptidases and the red arrow shows the box containing all the classes of endopeptidases, according to the chemical group present in their catalytic sites.