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Schematic depicting the secondary-structural features of VP55 that ‘cross over’ between domains. The black coil represents the ‘crossover helix’ (see text). Loops 118–129 and 150–160, which connect the crossover helix to the N-terminal domain (see text), are colored gray. Also shown in gray (sideways ‘hockey-stick’ shape) is the extreme C-terminal β-hairpin of VP55, which makes tertiary contacts to the N-terminal domain of VP55.
