Figure 3.

Anomalous difference Patterson map calculated from the peak data set at a resolution of 3.2 Å. The asymmetric area of the Harker section (u = 0) is drawn at contour levels from 1.5σ to 10σ in 0.5σ steps. The numbered crosses indicate symmetry-related self-vectors of the three selenium sites assigned using self-vectors calculated from the solution given by SOLVE in PHENIX (Adams et al., 2010 ▶; Terwilliger, 2000 ▶).