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Catalytic center of FlK. A, the catalytic triad of FlK is composed of Thr42, His76 (shown as sticks), and a conserved water molecule (Wat) (shown as a sphere). Green and orange colors indicate the two protomers of the dimer, respectively. B, the catalytic triad is located at the dimer interface. The electron density map used was 2Fo − 2Fc.
