(A) RRP is produced by transfecting plasmid encoding 78kDa/NSm/Gn/Gc proteins into BHK-rep cells stably supporting the replication of L RNA and S-GFP RNA. Inoculation of RRP into naïve cells results in transcription/replication of L and S-GFP RNA and expression of L, N, and GFP proteins. (B) scMP-12 is generated in BSR-T7/5 cells stably expressing T7 polymerase by co-transfection of plasmids, each encoding L, N, and Gn/Gc proteins, L RNA, S RNA and M RNA encoding Gc mutant. Released scMP-12 contains viral RNAs and is competent for initiation of infection, as it carries wt Gn/Gc derived from the protein expression plasmid. scMP-12 is further amplified in Vero-G cells stably expressing wt Gn/Gc. Inoculation of scMP-12 into naïve cells results in viral RNA synthesis, expression of viral proteins, and production of non-infectious VLPs.