Protein clusters selected for the generation of peptides.

Protein clusters were tested in the form of overlapping peptides, shown by cluster id, protein family to which they belong, number of proteins per cluster, the ratio of proteins with a prediction to be secreted over those predicted to be intracellular and the number of the peptide pool in which those proteins were tested. Peptide pools 18–20 consisted of peptides which hit bacterial reference proteins with a low affinity on protein BLAST. These peptides came from all clusters, and were tested separately from the others as there was a concern they may be less specific.