transported into the nucleus to start transcription; mRNAs formed in
the transcription process are transported to cytoplasm and are translated
into proteins necessary for viral particle replication. Newly synthesized
viral genome segments and proteins are assembled to form new vRNPs
in the nucleus, which are then transported from nucleus back into the
cytoplasm for final packaging. The exportation of vRNPs from the
nucleus requires viral nucleoprotein (NP).