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proteases were not described until 1995 and 2004 respectively. The mechanism used to cleave a peptide bond involves making an amino acid residue that has the cysteine and threonine (proteases) or a water molecule (aspartic, glutamic and metalloproteases) nucleophilic so that it can attack the peptide carbonyl group. One way to make a nucleophile is by a catalytic triad,

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