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Figure 4
Alternative protonation states of some common buffers (note the alternative tautomeric forms of HEPES at lower pH and histidine at higher pH). Marvin was used to draw chemical structures (https://www.chemaxon.com).

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 73| Part 2| February 2017| Pages 131-140
https://doi.org/10.1107/S2059798316020283
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