| for digestion | 5 | purpose |
| in controlling purple sea urchin competence | 3 | other |
| very | 2 | degree |
| histamine → be → important | 7 |
| histamine → be → essential | 5 |
| histamine → be → critical | 3 |
| histamine → be → indispensable | 3 |
| negative | neutral | positive |
| 0.137 | 0.565 | 0.298 |
| Raw frequency | 18 |
| Normalized frequency | 0.467 |
| Modifier score | 0.500 |
| Perplexity | 212.132 |