These are molecules that exist naturally in cell membranes and are activated by certain enzymes and kinases generated by receptors.
这些分子存在于细胞膜表面,能被受体激活的某种酶或激酶所活化
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
These kinds of molecules which activate genes, they're activating the process of transcription.
这种分子能够激活基因,激活了转录过程
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