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N端（亦作N-端，英語：N-terminus），又稱氮端、氨基端，指多肽鏈具有遊離的α氨基的末端[1]。在轉譯過程中，多肽鏈是從N端往C端合成的，因而在書寫多肽序列時，從N端開始書寫，從左到右寫到C端。
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