Coexpression of F and G of NiV (A) and M74 (B) in HypLu/2, EidNi/41, and HBE cells. At 24 h p.t., cells were fixed, permeabilized, and incubated with anti-HA and anti-FLAG antibodies, followed by incubation with secondary Cy3- and FITC-conjugated antibodies. Scale bar indicates 25 μm.