The structure of many proteins is mostly described in three levels, but a quaternary structural level must be considered if the protein consists of more than one polypeptide chain.
许多蛋白质结构主要用三种标准描述，但是如果蛋白质包含一个以上的多肽链，就必需考虑四级结构标准。
Some proteins consist of more than one polypeptide chain, and the association of these subunits in the protein gives rise to the quaternary structure.
一些蛋白质不只是由一个多肽链组成的，并且这些蛋白质亚基的结构产生了四级结构的。
Some proteins consist of more than one polypeptide chain, and the association of these subunits in the protein gives rise to the quaternary structure.
一些蛋白质不只是由一个多肽链组成的，并且这些蛋白质亚基的结构产生了四级结构的。
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