Table 1. An overview of the content of the three expression compendia that can be accessed through COLOMBOS.
| Escherichia coli | Bacillus subtilis | Salmonella enterica serovar Typhimurium | |
| Number of genes | 4295 | 4105 | 4525 |
| Number of contrasts | 1429 | 259 | 717 |
| source DB | GEO, AE | GEO | GEO |
| microarrays | 1483 | 265 | 723 |
| experiments | 84 | 9 | 25 |
| platforms | 35 | 13 | 9 |
| Missing values | 6.1% | 6.40% | 3.90% |
| Condition properties | 242 | 67 | 77 |
| Condition ontology terms | 56 | 24 | 23 |
| External DBs | |||
| pathway | EcoCyc | BioCyc | BioCyc |
| regulon | RegulonDB | DBTBS | |
| operon | EcoCyc | BioCyc | BioCyc |
| GO | UniProt GOA | UniProt GOA | UniProt GOA |