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The nucleotide sequences of three mitochondrial virus double-stranded (ds) RNAs, RNA-4 (2599 nucleotides), RNA-5 (2474 nucleotides), and RNA-6 (2343 nucleotides), in a diseased isolate Log1/3–8d2(Ld) of the Dutch elm disease fungusOphiostoma novo-ulmihave been determined. All these RNAs are A-U-rich (71–73% A + U residues). Using the fungal mitochondrial genetic code in which UGA codes for tryptophan,...