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OOV expressions for different train/test sets. The smaller sized biomedical treebank PennBioIE, only 2,931 trees in total, leads to a lacking coverage of the vocabulary.
| WSJ-test | Genia-test | PennBioIE-test | |
|---|---|---|---|
| WSJ-Train | 4% | 24% | 23% |
| Genia-Train | 6% | 13% | |
| PennBioIE-Train | 8.5% |
