Levels of the cellular housekeeping genes GAPDH and 18S rRNA, negative-strand E (negE), and sgE relative to total levels of E RNA were measured in infected cells, clarified supernatants and virus concentrated through a sucrose cushion by ultracentrifugation. Data points represent four technical replicates from two independent experiments (Cell and Supernatant) or three replicates (Concentrated Virus) and are normalized to the total levels of E for each sample, plotted as mean with error bars plotted as +/- SEM. 