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Electron micrographs of in vitro procapsid assembly products. Procapsid assembly reaction products with the following scaffolding proteins were observed by negative stain electron microscopy: (A) WT his-tag; procapsids generated with authentic WT scaffolding protein are shown in the inset, (B) E290A, (C) 5-Ala and (D) SM1. The magnification was 43,000X. Scale bar represents 100 nm.
