Control infection of A549-GST and A549-MxB cell clones with the HIV-1-based luciferase reporter virus NL-Luc49 and influenza A virus (IAV) confirmed that MxB restricts replication of HIV-1 but not IAV9–12 (Supplementary Fig. 5b and Fig. 2c). The gene discussed is MX2; the disease is infection.