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Northern blot analysis enabled differentiation between synthesis of viral mRNA and replication intermediates. The functionality of the system was demonstrated by probing residues predictably involved in the cap-snatching endonuclease active site in the L protein. Corresponding mutations led to a selective defect in the viral mRNA synthesis as described for other bunyaviruses. The analysis of further L gene mutants revealed an essential role of a C-terminal region in the RVFV L protein in viral transcription. 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