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Number of compound mechanisms (clusters) revealed as a function of number of assays screened. Assays were selected from the pool of all caspase and viability assays. (a) As more assays are utilized for clustering, the average number of clusters identified increases. (b) A plot of the distribution of cluster number as a function of the number of assays shows the gradual convergence near 24 clusters as the number of assays increases (line color becomes darker).
