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Fundamental principles of the regulation

Describe the fundamental principles of the regulation? Briefly describe the principles?

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The principle for regulation (especially of Gene expression) lies in either positive control (or eukaryotes) or negative control (or prokaryotes and lower eukaryotes). It mainly based on certain cis acting elements such as promoter, enhancer and so on and trans acting elements such as repressors, transcription factors and so on.

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