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Analysis of DI RNA mutants containing compensatory mutations and strand-specific disruptions in the upper portion of S4. (A) Depiction of S4 mutants where boxes (or shading) show the residues modified and substitutions are shown in bold. (B, C, and D) Northern blot analysis of DI RNAs and quantification of their accumulation levels. sg1 and sg2, subgenomic mRNAs 1 and 2; g, genomic mRNA.
