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Density of mentions of semantic class per thousand words in abstracts and bodies.
| Semantic class | Abstracts | Bodies |
|---|---|---|
| Genes | 61 | 47 |
| Mutations | 0.08* | 0.28* |
| Drugs | 2.97* | 2.21* |
| Diseases | 4.1* | 3.74* |
Statistically significantly different pairs at P < .01 are marked by *.
