“Protein-building acid, informally” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.AMINO is the answer to the New York Times crossword clue “Protein-building acid, informally”. It was last seen in the puzzle of February 22, 2026, where it runs at 71 Down and fills 5 squares. It crosses 5 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.