N端（亦作N-端，英语：N-terminus），又称氮端、氨基端，指多肽链具有游离的α氨基的末端[1]。在转译过程中，多肽链是从N端往C端合成的，因而在书写多肽序列时，从N端开始书写，从左到右写到C端。
参见
参考
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