MX1 and infection: MxB but not its homolog MxA restricts infections of the herpesviruses HSV-1, HSV-2, MCMV, KSHV, and MHV-68, but its mode of action has not been elucidated (Crameri et al., 2018, Liu et al., 2012, Schilling et al., 2018, Jaguva Vasudevan et al., 2018).