An example is production of certain molecules called cytokines by T-cells that activate themselves.

细胞能分泌这类叫做细胞因子的分子,实现自激活

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They're sometimes called transcription factors and this is an example of a transcription factor that is itself activated or turned on by the presence of a steroid.

它们被称为转录因子,转录因子的一个例子就是,能够自激活或被激素激活

耶鲁公开课 - 生物医学工程探索课程节选