这个词是什么意思？
The frequency of occurrence, in a specific organism's DNA sequence, of one of several potential synonymous codons that code for a particular amino acid. Frequently, there is a nonrandom pattern (bias) in the usage of a particular codon or codons over other synonymous codons.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000081183 · MeSH 2026。
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