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Figure 2
Qualitative and quantitative overview of X-ray structures. (a) Uneven coverage of the tree of life. (b) Incomplete coverage of macromolecular diversity. (c) Distribution of resolution. Among the known structures, 77% are solved at resolutions better than 2.5 Å, but only 9% are at resolutions better than 1.5 Å, notably ∼600 at subatomic resolution (≤1.0 Å); only two proteins (the small crambin and an iron–sulfur protein) have been solved at ultrahigh resolution (∼0.5 Å).

IUCrJ
Volume 4| Part 4| July 2017| Pages 340-349
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517006595