Structural comparison of FH1-3 with DAF-(1-4) and CR1-(15-17). Schematic representations are drawn in PyMol: DAF-(1-4) (green), CR1-(15-17) (blue), and FH1-3 (CCP 1, red; CCP 2, magenta; CCP 3, orange). Overlays, performed on the cysteine Cα atoms, are as follows: A, DAF CCP 2 and FH1-3 CCP 1; B, DAF CCP 3 and FH1-3 CCP 2; C, DAF CCP 4 and FH1-3 CCP 3; D, CR1 CCP 15 and FH1-3 CCP 1; E, CR1 CCP 16 and FH1-3 CCP 2; F, CR1 CCP 17 and FH1-3 CCP 3. Plots to show comparison of intermodular angles (mean ± 1 S.D. for the ensemble in each case) between first and second modules (G) and second and third modules (H) of the functional sites within FH, DAF, and CR1 (site 2).