Table 2. Summary of data sources and clustering in the PROSPECT system: increasing the correlation coefficient cut-off increases the number of gene clusters.

Cut-off	Gene clusters
≥0.1	185
≥0.3	547
≥0.5	1531
≥0.7	3998
≥0.9	6272
1.0	6386

The numbers of gene clusters obtained with increasing correlation coefficient cut-off thresholds are shown. The 0.7 line (bold) is the cut-off used to cluster genes in the GExCluster database.