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Figure 7.
FIG. 7. Schematic diagrams of the two possible hydrogen
bonding schemes of the water channel near the purine N-1
position. A, hydrogen bonding scheme in which the first water
molecule is a donor to N-1 of 6-aminopurines (distances are from
the F-Ado A subunit). B, hydrogen bonding scheme in which the
first water molecule is an acceptor from N-1 of 6-oxopurines
(distances are from the Ino C subunit).
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