Table 1.

Characteristic of corpora

		AIMed	GENETAG	GENIA
Size	abstracts	225		1,999
	sentences	1,987	10,000	18,554
Entity	scope	human P/G	P/G/R	human P/G/R
	number	4,075	11,739	34,264(P)/10,002(G)/944(R)
	coverage	specific occurrence	specific occurrence	all occurrences
	type	no	no	Ontology
				7 types(P)/5 types(G)/5 types(R)

Legend:

Size: Number of abstracts or sentences in the corpus used in this research

Entity scope: Types of the named entities identified in the corpus: (P)rotein, (G)ene, (R)NA

Entity number: Number of the annotated in-scope entities in the corpus

Entity coverage: Coverage of in-scope entity occurrences in each sentence

Entity type: Explicit identification of the types of the annotated in-scope entities