Table 1. Statistics for the data sets used in refinement.

	SWT (unliganded)	SWTB (biotin complex)
Beamline	SSRL 9-1	SSRL 11-1
No. of reflections measured	960889	2310644†
No. of unique reflections	209071	137736
Resolution range (Å)	50.0–1.03 (1.05–1.03)	50.0–0.95 (0.97–0.95)
Completeness (%)	97.1 (99.8)	95.5 (70.2)
〈I/σ(I)〉	27.2 (5.7)	49.8 (1.5)
Rmerge	0.037 (0.223)	0.049† (>1.00)

^†The data set was originally processed to a maximum resolution of 0.88 Å. We were not able to reprocess the data with a 0.95 Å resolution limit. These overall values are for the larger data set and are approximations for the data to 0.95 Å resolution.