Disc electrophoresis of the soluble proteins in leaf extracts failed to reveal any change induced by infection with raspberry ringspot virus either in inoculated or in systemically infected symptom-bearing or recovered leaves of . Evidence is given that three of the four proteins previously thought to occur only in virus-infected or polyacrylic acid-injected leaves are probably normal constituents. Environmental conditions were critical for the change in protein pattern induced by alfalfa mosaic virus in tobacco leaves.


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