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Figure 5
The three different forms of His. (a) The protonated form which exists at pH < 6.0, (b) the deprotonated form which exists at physiological pH values between 6.5 and 7.5 and (c) the imidazolyl anion form which exists once both of the N–H atoms have been extracted.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
Volume 70| Part 9| August 2014| Pages 1135-1142
doi:10.1107/S2053230X14016161
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