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Alignment of regions spanning the putative active-site catalytic triad with presumed members of the HtrA/DegP family of serine proteases. The numbers represent sequence gaps, and the putative catalytic triad residues (H, His; D, Asp; S, Ser) are boxed. The most conserved regions are shadowed. Accession numbers (Ac.) are taken from the GenBank, EMBL and SwissProt databases.
