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Enzyme activity in heterologous mixtures of NrdA and NrdB protein from F. ignava and L. blandensis. A, GDP reduction in presence of dTTP as effector. Assays were performed in triplicate with standard deviations shown. B, ATP (●) and dATP (○) titrations of F. ignava NrdA plus L. blandensis NrdB in presence of 2 mm dTTP and with GDP as substrate. ATP and dATP titrations in assays with CDP as substrate are shown in Fig. S6.
