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Protein composition of r-cores+ς1. Purified virions, cores, r-cores, and two preparations of r-cores+ς1 (no. 1 and no. 2) (8 × 1010 particles each) were subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis (10% acrylamide) and Coomassie blue staining. Positions of viral proteins are indicated at left, and the position of ς1 is highlighted with arrows.
