Event extraction performance is evaluated using the evaluation script provided by the BioNLP'09 shared task organizers for the development data set, and the online evaluation system of the task for the test data set 2 .
we note that the parsers may produce more fine-grained word segmentations than that of the gold standard: for example, two words "p70(S6)-kinase activation" in the gold standard tree (Figure 6 (a)) is segmented into five words by Enju ( Figure 6 (b)).