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Figure 1
Difference nuclear density demonstrating the protonation of Nη of the heme-coordinating histidine in myoglobin. Reprinted with permission from Nature Publishing Group: Phillips & Schoenborn (1981BB75), Nature (London), 292, 81–82. Copyright (1981) Nature Publishing Group.

IUCrJ
Volume 4| Part 1| January 2017| Pages 72-86
ISSN: 2052-2525
https://doi.org/10.1107/S205225251601664X