L-Tryptophan is a neutral, genetically coded amino acid. IIt is essential in human nutrition. Formed from proteins during the digestive process by the action of proteolytic enzymes.

• 色氨酸是一种重要的中性必需氨基酸，在消化过程中，通过蛋白水解作用酶的运动而由蛋白质形成。