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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