Later in infection, M is ferried to the cytoplasm by XPO1 (Figure 2xvi; Ghildyal et al., 2009a), where it localizes to viral inclusion bodies (IBs; Lifland et al., 2012), and functions as an adaptor bringing together newly formed nucleocapsids and envelope glycoproteins F and G (Ghildyal et al., 2002, 2005b, 2006) to effect virus assembly. This evidence concerns the gene XPO1 and infection.