Figure 2

The location of sequence divergence five sets of three VSG type B in N-terminal domains. The descending alpha helix of the long coiled coil is purple and the ascending helix blue; the surface loops at the top of the VSG are in green. The colours are then used to highlight the same regions in the primary structure in plots of sequence variation. The average variation at each residue for the three different structural components of the VSG is shown below the primary structure representation.