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Table 8 Example of a sentence tokenised and labelled with part-of-speech and chunk tags.

From: Optimising chemical named entity recognition with pre-processing analytics, knowledge-rich features and heuristics

Surface form Lemma Part-of-speech tag Chunk tag
It It PRP B-NP
attenuated attenuate VBD B-VP
GSK214a GSK214a NN B-NP
-induced -induced JJ I-NP
gestation gestation NN I-NP
in in IN B-PP
rats rat NN B-NP
. . . O