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Cryo-EM density (blue) of the procapsid with an icosahedral two-fold axis vertical. The difference map of the procapsid minus the provirion cryo-EM density (in red), shows the presence of the B scaffolding protein on the two-fold axis. G pentamer and F pentamer structures are shown on either side of the two-fold axis. Note the additional density outside the F capsid proteins, which has been assigned to the D scaffolding proteins.
