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Models for interaction of the gp3 ring assembly of Figure 3 with double-stranded B DNA and the P22 portal. The dsDNA, terminase ring and portal vertex are plotted on the same scale. (a) Passage of dsDNA through the central hole of the gp3 ring assembly. (b) Binding of dsDNA to the periphery of the gp3 ring assembly. Docking of the funnel-shaped gp3 ring at the portal neck is depicted in neck-to-neck (c) and mouth-to-neck (d) orientations.
