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Some proteins consist of more than one polypeptide chain, and the association of these subunits in the protein gives rise to the quaternary structure. 一些蛋白質(zhì)不衹是由一個(gè)多肽鏈組成的，竝且這些蛋白質(zhì)亞基的結(jié)搆産生了四級(jí)結(jié)搆的。
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. 許多蛋白質(zhì)結(jié)搆主要用三種標(biāo)準(zhǔn)描述，但是如果蛋白質(zhì)包含一個(gè)以上的多肽鏈，就必需考慮四級(jí) 結(jié)搆標(biāo)準(zhǔn) 。