Structural comparison of the LBPs of FTZ-F1 and LRH-1. A, structures of both FTZ-F1 LBD (left) and hLRH-1 LBD/EPH (right) show that H6 (cyan) of FTZ-F1 LBD occupies the LBP similar that of EPH in the hLRH-1 LBD. B, the 2Fo − Fc omit map of the H6 of FTZ-F1 LBD is shown at 1.2σ. C, the LBP of the FTZ-F1 LBD is completely filled by H6 unlike in LRH-1 LBD and SF-1 LBD. Helix 6 is displayed in cyan. Positions of H6 in FTZ-F1 LBD, LRH-1 LBD bound to EPH, and SF-1 LBD bound to phosphotidylethanol are represented with surface figures.