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Figure 4
Electron density maps of proteinase K. (a, b) Close-up views of the proteinase K structure with a 2Fo − Fc electron-density map contoured at the 2.0σ level (coloured blue) and (b) the Fo − Fc electron-density map contoured at the 2.2σ level (coloured pink). (c, d) Close-up views of Eu ion binding sites with 2Fo − Fc electron density maps contoured at the 2.0σ level (coloured blue). Bound Eu ions are depicted as magenta spheres. The anomalous difference Fourier maps using all indexed images (contoured at the 3.5σ level) are shown in magenta.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 5| September 2026|
https://doi.org/10.1107/S1600577526005643
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