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In plant viruses, genomic variation caused by mutation is enhanced by recombination, pseudo-recombination and acquisition of extra genomic components. Genomic RNA typically has a high mutation rate, and individual virus isolates consist of swarms of mutants, with the consensus sequence changing in response to selection pressure. Recombination is found among field isolates of some RNA viruses, especially...
The complete sequence of the 2315 nucleotides in RNA 3 of potato mop-top furovirus (PMTV) isolate T was obtained by analysis of cDNA clones and by direct RNA sequencing. The sequence contains an open reading frame for the coat protein (20K) terminated by an amber codon, followed by an in-phase coding region for an additional 47K. PMTV therefore resembles soil-borne wheat mosaic (SBWMV) and beet necrotic...
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