| including oxygen-binding sites | 2 | other |
| carrier → have → surface | 3 |
| carrier → comprise → surface | 3 |
| carrier → have → upper surface | 3 |
| negative | neutral | positive |
| 0.032 | 0.842 | 0.125 |
| Raw frequency | 9 |
| Normalized frequency | 0.191 |
| Modifier score | 0.500 |
| Perplexity | 433.081 |