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The Relation of Tobacco Mosaic Virus X-Protein to Amorphous Cellular Inclusions (X-Bodies). A. L. Granett, Department of Plant Pathology, University of California, Davis 95616, Present address of senior author: Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456; T. A. Shalla, Department of Plant Pathology, University of California, Davis 95616. Phytopathology 60:426-430. Accepted for publication 1 October 1969. DOI: 10.1094/Phyto-60-426.

Two common (U-1[D] and U-1[SB]) strains of tobacco mosaic virus and U-5 were used to determine whether the frequency of amorphous intracellular inclusions (X-bodies) correlated with extractable X-protein. Although U-1(SB) produced more X-bodies than U-1(D), no consistent differences were found between these common isolates in X-protein yields. The U-5 strain produced X-bodies only rarely, and yielded no X-protein.