From: The genetic organisation of prokaryotic two-component system signalling pathways
 | Genes with ≥1: | T | R | P | # of genes |
---|---|---|---|---|---|
# Domains | 1 | 15691 | 21614 | 1012 | 38317 |
in gene | 2 | 3202 | 3591 | 137 | 3605 |
 | 3 | 1105 | 1135 | 707 | 1136 |
 | 4 | 331 | 343 | 244 | 343 |
 | 5+ | 25 | 25 | 17 | 25 |
 | Total | 20354 | 26708 | 2117 |  |