转录因子与DNA的相互作用是基因表达调控系统的重要组成部分。
The interaction between transcription factors and their DNA recognition sites are important for the regulation of the network that controls gene expression.
基因表达的精确调控是化学诱导系统的重要方面。
The precise timing and control of gene expression are important aspects of chemically inducible systems.
结论：四环素调控系统基本上可以控制毒素基因在人胃癌细胞中的表达。
Conclusions: the chimeric gene can be controlled by tetracycline-controlled system and result in cellular toxicity in the absence of tetracycline.
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