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Self-rotation function at the χ = 180° section. The map was calculated in the resolution range 50–4 Å with an integration radius of 25 Å and drawn with contour intervals of 0.5σ. A significant peak was observed at the position θ = 170.9°, ω = 90.0°, χ = 180.0°. The figure was drawn with CCP4/MOLREP (Collaborative Computational Project, Number 4, 1994 ▶).
