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Snapshot from the Fig. 5, bottom panel (red (+) plot) trajectory illustrating two hydrogen bonds between sialic acid carboxyl oxygens (red) and two guanidinium hydrogens (white) of the Arg154 sidechain. Panel A shows the CD44 backbone in cartoon representation, Arg41 and Arg154 sidechains in line representation, and glycan (covalently linked to Asn25 (ribbon in red)) in ball and stick representation. Panel B is a close-up view of the Arg154 sidechain and sialic acid interaction.
