Protein structures of influenza polymerase subunit PB2 from a variety of viral strains obtained using the methods described in this publication. PDB codes (clockwise from top left): 3r2v
(T. E. Edwards, A. S. Gardberg & B. Sankaran, unpublished work), 3kc6
(Yamada et al., 2010), 3l56
(Yamada et al., 2010) and 3khw
(Yamada et al., 2010).