Crossword clue: a fully differentiated structural and functional unit in an animal that is specialized for some particular function

The most common answer is organ (5 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

organ 5 letters wn-def

a fully differentiated structural and functional unit in an animal that is specialized for some particular function