tryptophan and other substances

例句：

1. 1.Tryptophan is an essential amino acid that helps the body produce serotonin, a neurotransmitter that affects mood and sleep.
   色氨酸是一种必需的氨基酸，有助于身体产生血清素，这是一种影响情绪和睡眠的神经递质。
2. 2. In addition to being a key component of protein synthesis, tryptophan also plays a role in theproduction of melanin, the pigment responsible for skin color.
   除了是蛋白质合成的关键成分外，色氨酸还在黑色素的产生中发挥作用，这是皮肤颜色的决定因素。
3. 3. The body's ability to synthesize tryptophan is influenced by genetic factors and environmental conditions such as sunlight exposure.
   人体合成色氨酸的能力受到遗传因素和环境条件如阳光暴露的影响。