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104 Crabtree et al.Fig. 5. Best bidirectional hit analysis on individual polypeptides. The circles representpolypeptides from three distinct genomes, and an edge from PX to PY indicates that PY isthe best BLASTP match for PX (among all polypeptides in the same genome as PY). Inorder to simplify the example matches between Genome C and Genome A, whichwould usually be taken into account, are not considered. If the bidirectional best hitclustering were applied to this example—considering only matches between individualpolypeptides—then the result would be a single orthologous cluster (JOC), containing P5,P8, and P11. No other polypeptides would be clustered.Fig. 6. Best bidirectional hit analysis on JACs. By computing bidirectional bestBLASTP matches between JACs instead of individual polypeptides one is able to generatelarger clusters. In this example, based on the same polypeptides and BLASTPmatches as in Fig. 4, there would be two JOCs: one that contains all the polypeptidesin JAC1 and JAC3 and one that contains all those in JAC2, JAC4, and JAC5.be skipped for any cluster that contains more than a given number of polypeptides.This parameter is set by default to 30 proteins.13. As a consequence of the way that the clusters are calculated and the average percentcoverage and identity scores are defined, it is possible to have a cluster of two

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