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isoleucine vs. leucine

isoleucine

noun

Biochemistry.
  1. a crystalline amino acid, C 6 H 13 O 2 , occurring in proteins, that is essential to the nutrition of humans and animals. : Ile; : I

leucine

noun

Biochemistry.
  1. a white, crystalline, water-soluble amino acid, C 6 H 13 NO 2 , obtained by the decomposition of proteins and made synthetically: essential in the nutrition of humans and animals. : Leu; : L