Table 3.

Dataset used for training SVM classifiers

Headwords	Positive	Negative	SemCat catogories
Gene	3532163	1631676	GENE_OR_PROTEIN
			DNA_MOLECULE
Protein	3533621	1630690	GENE_OR_PROTEIN
			PROTEIN_MOLECULE
Disease	88653	5096888	DISEASE_OR_SYNDROME
			INJURY_OR_POISONING
			SIGN_OR_SYMPTOM
Cell(s)	14581	5178142	CELL

For each keyword, terms from relevant SemCat categories were merged and used for the classifiers.