Fig. 3.

Iron K-edge EXAFS (A), nonphase-shifted EXAFS Fourier transforms (B), and x-ray absorption edge spectra (C) for ΔnifB Av1 (black), ΔnifH Av1 (green), ΔnifH Av1′ (blue), and ΔnifB Av1^V (red). The samples were prepared and measured as described in Materials and Methods.