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. Author manuscript; available in PMC: 2008 Aug 10.
Published in final edited form as: Science. 2007 Aug 10;317(5839):825–828. doi: 10.1126/science.1135165

Fig. 1.

Fig. 1

Structural and genetic basis for hemagglutinin mutations. (A) The RBDs of alternative viral hemagglutinins are shown. (B) Comparison of amino acid sequences in the major 130 and 220 loops and the 190 helix, color-coded in purple, lavender, and green, respectively.