Strain-variable editing during transcription of the P gene of mumps virus may lead to the generation of non-structural proteins NS1 (V) and NS2 Elliott, G. D. and Yeo, R. P. and Afzal, M. A. and Simpson, E. J. B. and Curran, J. A. and Rima, B. K.,, 71, 1555-1560 (1990), doi = https://doi.org/10.1099/0022-1317-71-7-1555, publicationName = Microbiology Society, issn = 0022-1317, abstract= The sequence of the P (phosphoprotein) gene of mumps virus has been determined. It has two open reading frames, the first of which probably encodes the NS1 (or V) protein of mumps virus. Expression of the P protein requires the insertion of two non-templated residues to link the two ORFs in a process analogous to that observed in the P/V gene of simian virus type 5 to which mumps virus is closely related. Strain differences in the accuracy of insertion of non-templated G residues in the P/V gene transcripts have been described., language=, type=