| NOUN | substance | tryptophan, tryptophane | an amino acid that occurs in proteins |
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| Meaning | An amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin. | |
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| Synonym | tryptophane | |
| Broader | essential amino acid | An amino acid that is required by animals but that they cannot synthesize |
| Spanish | triptófano | |
| Catalan | triptòfan | |
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