Fig. 70: Diagram illustrating the arrangement of the VP 3 scaffold in the core particle of blue-tongue virus. The packing unit, a dimer of VP 3, composed of a red and a green subunit, is enclosed within the dotted red line. 60 such dimers form the icosahedral scaffold, the symmetry axes of which are marked in white. Arrows indicate the displacement of the dimer axis from the icosahedral 2-fold axis (courtesy of D. Stuart).