IFNA1 and HIV-1 infection: Though it lacks antiviral function (Goujon et al., 2013, Kane et al., 2013, Fricke et al., 2014, Matreyek et al., 2014), this result prompted us to revisit the functionality of MX2 Δ1-25 during the IFN-induced inhibition of HIV-1 infection (when this form is naturally expressed; Goujon et al., 2013, Kane et al., 2013).