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a - Superposition of all studied proteins, with catalytic dyad ball-and-stick representation; b - superposition of five studied proteins with their co-crystallized ligands. (6LU7 – orange; 6Y2E –yellow; 6Y2F – green; 6Y2G – light blue; 6M03 – purple; 6Y84 – magenta; 5RF8 – dark blue; 5RG0 – grey; 5R8T – red).
