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ClustalW alignment of the sequences of human neutrophil elastase (1B0F_A), porcine pancreatic elastase (1B0E_A), and human matriptase (1EAX_A). Sequence identities are marked with an asterisk underneath and shown in red. The catalytic triad consisting of amino acids His 57, Asp 102, and Ser 195 is shown in yellow. Residues with “:” or “.” underneath denote conserved amino acids.
