TRANSCRIPTION FACTORS. “So we can think of these TFs as kinds of functions that employ certain logic to turn the transcription of genetic material on and off and to regulate its speed. This reminds me of the reactive data bindings in the JavaScript app framework called Meteor. In effect, the TF binds to all areas producing a certain type of protein in a certain cell line (the scope of the function) and keeps them all coordinated in real time.” (TF = transcription factor).
http://www.forbes.com/sites/anthonykosner/2013/12/13/seven-ways-to-look-at-the-double-meaning-of-dna-code/#2715e4857a0b7e447793109a