| to generate a proton gradient | 4 | purpose |
| in a variety of situations | 3 | temporal |
| bacteria → use → light | 8 |
| bacteria → be exposed to → light | 7 |
| bacteria → sense → light | 5 |
| bacteria → respond to → light | 5 |
| bacteria → absorb → the light | 3 |
| negative | neutral | positive |
| 0.310 | 0.555 | 0.135 |
| Raw frequency | 28 |
| Normalized frequency | 0.334 |
| Modifier score | 0.500 |
| Perplexity | 456.813 |