Figure 1: Threshold ranks and number of genes selected by intersections. A threshold rank was calculated for each intersection with the equation r = [1- (1-p )1/n ]1/k ×N where p represents the probability a gene has to be selected, r the maximum rank of a gene to be selected with the probability p, N the number of genes represented on the microarray, k the number of datasets taken into account in the intersection and n the number of genes likely to be involved in the phenomenon studied. The red bars show the logarithm of the threshold ranks + 1 (to avoid log (0)). The threshold ranks selected a defined number of genes per intersection. The blue bars show the logarithm of the number of selected genes + 1 (to avoid log (0)).