an.ti.co.donn.(名词)A sequence of three adjacent nucleotides in transfer RNA designating a specific amino acid that binds to a corresponding codon in messenger RNA during protein synthesis.反密码子:在蛋白质合成过程中,传送者RNA中的相关密码子与某种氨基酸结合,在传送RNA过程中出现的三个相邻的核苷酸序列