Histogram of the number of peptide masses with Wilcoxon-Mann-Whitney probability p-values of the control versus breast cancer group. All 1949 identified peptide masses in the matrix are presented as a function of the Wilcoxon-Mann-Whitney probability p-value. The Wilcoxon-Mann-Whitney p-value is calculated for each peptide mass based on its occurrences in replicate samples in each group. The white bars represent the frequency of the peptide masses with a p-value in the control group, while the black bars represent the frequency of the peptide masses with a p-value in the breast cancer group.
Titulaer et al. BMC Bioinformatics 2006 7:403 doi:10.1186/1471-2105-7-403