Crossword Genius

Protein-building acid (5)

Ross

I believe the answer is:

amino

'protein-building acid' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for amino that I've seen before include "Acid found in proteins" , "- - acids" , "Minor insult; slim" , "sort of acid?" , "(Protein constituent) acid" .)

I've seen this clue in The New York Times.
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