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Synthesis of deoxynucleotide-containing RNA-like single-stranded polynucleotides (dcRNAs) using the Y639F, S641A mutant of T7 RNA polymerase (T7 RNAP) was studied. A number of different T7 promoter-containing plasmids were tested as templates for dcRNA synthesis. The dcRNA synthesis efficiency strongly depended on the sequence of the first 8-10 nucleotides immediately downstream of the promoter and...