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. 2020 Jan 28;10:1371. doi: 10.1038/s41598-020-57675-7

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Electron density maps of proteinase K. Close-up views of calcium ion binding sites with 2F_o–F_c electron density maps contoured at the 2.0 σ level (coloured blue) for (a,b) paraffin grease, (c,d) DATPE grease, (e,f) nuclear grease and (g,h) cellulose matrices. Bound calcium ions are depicted as magenta spheres. The anomalous difference Fourier maps using 20,000 indexed images (contoured at the 3.5 σ level) are shown in red. The anomalous peak heights obtained from ANODE are displayed in figures. These figures were drawn with PyMol (http://www.pymol.org).