基于三个转录子位置的碱基组态分析，转译层次上的筛选效应存在于所有的细菌当中。
The selection pressure at the translation level is evident in all bacteria based on the analysis of the skew at the three codon positions.
但是，令人惊讶的是，处于调节层次底部的转录因子对细胞的生存更为重要。
Surprisingly, however, TFs at the bottom of the regulatory hierarchy are more essential to the viability of the cell.
研究人员曾经认为主控转录因子通过直接调节许多基因来产生广泛的影响，但事实上具有最多直接的调节靶标的转录因子处于这种层次网络的中间。
Finally, one might think master TFs achieve their wide influence through directly regulating many targets, but TFs with most direct targets are in the middle of the hierarchy.
其基因表达包括基础水平表达和诱导表达两个层次，代表了一类转录调控方式，是研究真核基因转录调控的一个很好模型。
The regulation of hsp gene transcription is an elaborated and complex process, including the regulation of basic transcription and inducible transcription.
其基因表达包括基础水平表达和诱导表达两个层次，代表了一类转录调控方式，是研究真核基因转录调控的一个很好模型。
The regulation of hsp gene transcription is an elaborated and complex process, including the regulation of basic transcription and inducible transcription.
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