You will be presented a sentence from biomedical research text. Extract all terms that correspond to chemical entities of biological interest (ChEBI).
Return your identified terms in a JSON array, formatted like this: ["Entity1", "Entity2", ...].
If no such entities are detected, respond by providing an empty JSON array [].

Biomedical context:
ArestrictedexpressionofK14isalsofoundinthymicepithelialcells(TECs)inthemedullaofnormalthymus[20].
[]