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Surface representation of the difference map between DNA-containing and empty AAV-2 capsids. A surface representation of the difference map from DNA-containing capsids and empty capsids (blue) was superimposed to a surface representation of half of the empty capsid (yellow). A direct view down a twofold symmetry axis (A) and a side view (B) are shown. One of the globules at the twofold symmetry axes inside the capsid is labeled by a white arrowhead.
