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Cover photograph (Copyright © 2000, American Society for Microbiology. All rights reserved.): Trypsin-induced structural transformation in aquareovirus. Radially colored structures of aquareovirus: native (top left), naturally degraded (top right), after 5 min of trypsin treatment (bottom left), and after 2 h of trypsinization (bottom right). (See related article on page 6546.)


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