色氨酸

例句：

1. 1. Tryptophan is an essential amino acid that helps the body produce melanin.
   色氨酸是一种必需的氨基酸，有助于身体产生黑色素。
2. 2. The diet of a bird with a high tryptophan content is known to have a positive effect on its cognitiveabilities.
   具有高色氨酸含量的饮食对鸟类的认知能力有积极影响。
3. 3.In humans, tryptophan is converted into serotonin and dopamine in the brain, which can affect mood and sleep patterns.
   在人类中，色氨酸在大脑中被转化为血清素和多巴胺，这可以影响情绪和睡眠模式。