Fig. 14.20From: Viruses with Single-Stranded, Positive-Sense RNA GenomesStructure of an arterivirus particle represented by porcine reproductive and respiratory syndrome virus. Inside the particle, the RNA genome is associated with N proteins in a helical nucleocapsid, which is enclosed by a membrane envelope, in which four viral glycoproteins (GP2–GP5) and the non-glycosylated M protein are embeddedBack to chapter page