?:definition
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A transcription initiation process during which a nucleotide sequence between 10 and 20 nucleotides in size is cleaved from the 5\' end of host mRNAs by a viral RNA-dependent polymerase. The capped leader sequence obtained is subsequently used to prime transcription on the viral genome, which ultimately leads to the synthesis of capped, translatable viral mRNAs. [GOC:bf, GOC:jl, VZ:839]
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