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Histidine likes to bind tightly to zinc ions .

组氨酸喜欢跟锌离子紧密结合。

Indeed , it has ten times more histidine than the average protein .

实际上，它含有的组氨酸是普通蛋白质的10倍。

And a molecule of histidine contains only so many suitable atoms .

而在一个组氨酸分子中只能容纳某固定数的合适原子。

And a molecule of histidine contains only so many

一个组氨酸分子只能包含这么多合适的原子。

The nine essential amino acids are histidine , isoleucine , leucine , lysine , methionine , phenylalanine , threonine , tryptophan and valine .

九个必需氨基酸有组氨酸，异亮氨酸，亮氨酸，赖氨酸，蛋氨酸，苯丙氨酸，苏氨酸，色氨酸和缬氨酸。