Formation and maintenance of the RNP complex are the most important functions of the N protein.[9] It also regulates the replication and transcription of viral RNA, and in the host, it inhibits protein translation through EF1α-mediated action,[9] alteration of host cell metabolism, host cell cycle (N proteins are reported to inhibit CDK4), and apoptosis.[39] In human peripheral blood, N protein inhibits cell proliferation through the inhibition of cytokinesis.[68]