Of these substances, the most important is tyrosine.

在这些物质中， 最重要的是酪氨酸。

First, with the help of enzyme tyrosine hydroxylase (TH), tyrosine gets converted to L-dopa, also known as levodopa.

首先，在酪氨酸羟化酶（TH）的帮助下，酪氨酸也转化为左旋多巴被称为左旋多巴。

So, here, inside this dopaminergic neuron, dopamine is synthesized in a two-step process starting with the amino acid tyrosine.

所以，在多巴胺能神经元内部，多巴胺是通过两个步骤合成的从氨基酸酪氨酸开始。

In the second step, the L-dopa formed by tyrosine hydroxylation is quickly decarboxylated by another enzyme called aromatic L-amino acid decarboxylase (AADC), to the neurotransmitter dopamine.

在第二步中，由酪氨酸羟基化形成的L-多巴通过酶快速脱羧另一种称为芳香族L-氨基酸脱羧酶（AADC）的神经递质多巴胺。

That, along with it containing tyrosine, an amino acid that aids neurotransmitter production, may make it hard to get some rest if you have a bunch of protein before bed.

因为它含有酪氨酸，酪氨酸是一种帮助合成神经传递物质的胺基酸。因此如果你在睡前食用蛋白质类食品，便可能造成睡眠困难。

Aldolase A is made of 350 amino acids, the building blocks of proteins, but the bit that does the work consists of only three of these: lysine, glutamic acid and tyrosine. The rest of the enzyme is packaging.

醛缩酶A由350种氨基酸组成，这些氨基酸是蛋白质的组成成分，但起作用的部分只有三个：赖氨酸、谷氨酸和酪氨酸。剩下的酶是包装的。