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General trends and correlations between changes in environmental factors, occurrence of selenium utilization traits, and occurrence of selenoproteins and their Cys-containing homologs in bacteria
| Environmental factor | Sec-decoding trait | Selenouridine trait | Selenoproteinsa | Cys-containing homologsa | |
| Oxygen concentration | ↑ | ↓ | ↑ | ↓ | ↑ |
| ↓ | ↑ | ↓ | ↑ | ↓ | |
| Temperature | ↑ | ↑ | ↓ | ND | ND |
| ↓ | ↓ | ↑ | ND | ND | |
aAs exemplified by Prx and HesB-like proteins. ND, not determined.
