Instead, before the start of the stretch of DNA coding for that gene is a short stretch called a promoter*—the “on” switch. What turns the promoter switch on? Something called a transcription factor (TF) binds to the promoter. This causes the recruitment of enzymes that transcribe the gene into RNA. Meanwhile, other transcription factors deactivate genes.

I thought of you when I read this quote from “Behave: The Biology of Humans at Our Best and Worst” by Robert M. Sapolsky –

“Instead, before the start of the stretch of DNA coding for that gene is a short stretch called a promoter*—the “on” switch. What turns the promoter switch on? Something called a transcription factor (TF) binds to the promoter. This causes the recruitment of enzymes that transcribe the gene into RNA. Meanwhile, other transcription factors deactivate genes.”

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