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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
tryptophan
1.
tryptophan
(substance)
an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin
Synonyms
tryptophane
Broader (hypernym)
essential amino acid
Based on WordNet 3.0 copyright © Princeton University.
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. English edition:
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