| for biomarker testing | 5 | purpose |
| for the last few years | 4 | temporal |
| properly | 3 | manner |
| tube → be → stored | 13 |
| tube → be used for → storing | 4 |
| tube → make for → storage | 3 |
| tube → be in → storage | 3 |
| negative | neutral | positive |
| 0.179 | 0.590 | 0.231 |
| Raw frequency | 23 |
| Normalized frequency | 0.380 |
| Modifier score | 1.000 |
| Perplexity | 223.491 |