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Ordered water molecule in the Arbidol-binding site in H7/SH2 HA. The ordered water molecule (shown as a red sphere) mediates interactions (indicated by black dashed lines) between HA2 Lys51 of helix-A, Glu103 of helix-C (cyan), and the β-hairpin Leu29′ carbonyl (gray). Arbidol is shown as yellow sticks. Distances are in Ångstroms.
