Figure 1From: Generation and characterization of a recombinant Newcastle disease virus expressing the red fluorescent protein for use in co-infection studiesCytopathic effect and expression or RFP and GFP in rLS-RFP- and rB1-GFP-infected DF-1 cells. Cells were inoculated with each virus at a MOI of 0.01 and examined under a fluorescence microscope 24 and 48 h pi.Back to article page