Megacluster of all time-course infections. The data across all time courses was averaged, ranked, and then clustered. All genes that were induced in the mock time course at levels higher than an average log2(ratio) of 0.5 were omitted. The four parallel time courses are shown on the left, with trends in gene expression appearing very similar for all time courses. Four individual 8-h time courses are on the right, and show the day-to-day variability of the response (which includes dependence on the time zero measurement).