In vitro C. parvum gene expression 0-72hr post-infection. A. Expression profiles of the 3,281 genes used in our study were sorted according to peak expression at each time point. Each row represents the expression profile of a single gene at 2, 6, 12, 24, 36, 48 and 72 hr post-infection. B. Distribution of genes per cluster. Of the 3,281 genes used in this study, we were able to cluster 2,949 into 200 clusters. Clusters range in size from 3 to 52 genes, with an average of 14.7 genes and a median of 13 genes per cluster. C. Expression profiles of a representative gene from each of the 200 clusters identified using FCM analysis. Each of the 200 rows in the heat map represents a single cluster. Genes were sorted according to peak expression at each time point.