Extended Data Figure 1: Disulfide bonds are well defined by X-ray crystallography.
From: Accurate de novo design of hyperstable constrained peptides

An Fo − Fc omit-map is shown in blue, contoured at 4σ, for design gEHEE_06. Disulfide sulfur atoms were removed, and the omit-map was calculated following real-space refinement. The gEHEE_06 structure is shown in grey as a cartoon representation. Disulfide bonds are shown here as sticks, with sulfur atoms in yellow and carbon atoms in grey.