Fig. 3: Structural comparisons of the glycan chains in different conformations of the filamentous HA.

a Structures of the glycan chains in different conformations viewed from the top of the HA spike. The glycan chains are colored from green to purple, based on their root mean square deviations from the symmetric position as in conformation A. b Structural superimpositions of the glycan chains in different conformations. The models are superimposed based on the protomers in the HA spike at the bottom of the filament. The glycan chains and the corresponding HA protomer are colored from green to purple, based on their root mean square deviations from the symmetric position as in conformation A.