Table 6. Histidine residues with unassigned features extending from the imidazole ring.

Residue	Modeled atom	Comments
EHis87	None	Interaction with ED146
EHis150	HOH	Distance 2.1 Å
EHis152	HOH	Distance 2.4–2.6 Å
GHis5	HOH	Density on both sides
GHis101	HOH	Positive environment
GHis123	HOH	Distance 2.2 Å
GHis427	HOH	Distance 2.85 Å
GHis653	HOH	Distance 2.5 Å, very strong
CDHis163	HOH	Distance 2.5 Å
CDHis507	HOH	Distance 4.2 Å