FIGURE 3. Capsid model and interactions of gp7.
From the following article:
Backbone structure of the infectious 
15 virus capsid revealed by electron cryomicroscopy
Wen Jiang, Matthew L. Baker, Joanita Jakana, Peter R. Weigele, Jonathan King & Wah Chiu
Nature 451, 1130-1134(28 February 2008)
doi:10.1038/nature06665
a, A full capsid model of gp7, with the same colour scheme as in Fig. 1c. b, The charged amino acids of gp7, viewed slightly offset from the three-fold axis. The residue labels are shown in blue and green, corresponding to the gp7 monomer colour scheme in a.
