Extended X-ray Absorption Fine Structure (EXAFS) and Fourier transforms (FT) of fIscU and Yah1. EXAFS spectra are provided in panels A, C, and E and FTs are provided in panels B, D, and F. Data (black) is compared to best fit simulations (green) of Fe-fIscU (A,B), FeS-fIscU (C,D), and FeS-Yah1 (E, F).