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(A) Purified virions of Cucumber mosaic virus (CMV) observed by transmission electron microscope. The sample was negatively stained with uranyl acetate. (B) Mosaic symptoms of CMV‐infected tobacco plant. The uninoculated upper leaves of the tobacco plant are alternately mosaic, then symptomless and, finally, again mosaic. This phenomenon is known as cyclic mosaic symptom expression. (C) Genomic structure of CMV and satellite RNA. The five open reading frames are denoted by boxes.
