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Morphology of purified GST-COPV L1 and COPV L1 preparations. The GST-L1 (A) and thrombin-cleaved L1 (B) proteins were negatively stained and examined by electron microscopy as described in Materials and Methods. Both preparations formed 11- to 12-nm capsomeric structures, with the characteristic donut appearance being less obvious in GST-COPV L1. Bars, 100 nm.
