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Location of amino acid at positions 154 and 223 in the 3D structure of H5 HA. (A) The amino acids in the 3D structure of the HA of A/duck/Singapore/3/97 (H5N3) virus (18). The glycosylation site at position 154 is located at the top of the HA molecule. (B) The circle represents the interface between the monomer shown and two other monomers (data not shown) in the trimeric HA. Amino acid at position 223 is located at the surface of the trimer.
