From: The genetic organisation of prokaryotic two-component system signalling pathways
 |  | Orphans | Paired Genes | Triad Genes | Tetrad Genes |
---|---|---|---|---|---|
Clusters: | Numbers | 16596 | 24380 | 2268 | 764 |
 | Percentage | 37.7 | 55.4 | 5.2 | 1.7 |
 | Ratio | 0.68 | 1.0 | 0.09 | 0.03 |
Foci: | Numbers | 17590 | 24042 | 1788 | 588 |
 | Percentage | 40.0 | 54.6 | 4.1 | 1.3 |
 | Ratio | 0.73 | 1.0 | 0.07 | 0.02 |