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Analysis of purified BVP1 virions on SDS- PAGE. Various amounts of BVP1 virions purified from infected leaves by CsCl2 density gradient centrifugation were analyzed by electrophoresis through a 12.5% polyacrylamide and stained with PlusOne Silver Staining Kit (Amersham Bioscience, Sweden). Lane M, molecular weight standards. The relative molecular weights were as indicated on the left.
