. . "essential amino acid"@en-us . . "14605787-n"^^ . . "113769429"@en-us . "114605787"^^ . "an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet"@en-us . "0"^^ . . . . "110568486"@en-us . "0"^^ . "essential amino acid"^^ . . .