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Figure 1
Spherical polar angles (θ, φ) defining the position of the carbonyl O atom relative to the disulfide plane. Of the two S atoms, that making the contact is labeled Sγ and the other is labeled Sγ′. The figure is based on the convention used in Bhattacharyya et al. (2004BB3).

IUCrJ
Volume 7| Part 5| September 2020| Pages 825-834
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520008520