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Figure 4
Cartoon plot of proteinase K with the anomalous difference density map calculated from all 64 665 indexed derivative images and the phases from the final refined model contoured at 5.0σ. The two Hg atoms (silver spheres) covalently bind to Cys73. The two green spheres correspond to the two bound calcium ions.

IUCrJ
Volume 5| Part 5| September 2018| Pages 524-530
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518009223