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Hydrogen bonding counts for the PZase-PZA complexes sorted according to the frequency of absence of H-bonds, obtained from MD runs. The different mutants are coloured according to their groups: Group 1 (green), Group 2 (orange), Group 3 (blue) and Group 4 (black), while the WT complex is in cyan. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
