| Planar tetramer
This protein has 4-fold rotational symmetry. Taylor, N. R., Cleasby, A., Singh, O., Skarzynski, T., Wonacott, A. J., Smith, P. W., Sollis, S. L., Howes, P. D., Cherry, P. C., Bethell, R., Colman, P., Varghese, J.: Dihydropyrancarboxamides related to zanamivir: a new series of inhibitors of influenza virus sialidases. 2. Crystallographic and molecular modeling study of complexes of 4-amino-4H-pyran-6-carboxamides and sialidase from influenza virus types A and B. J Med Chem 41 pp. 798 (1998) 1a4q (PDB)
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