FIGURE 2
FROM:
Modular cell biology: retroactivity and insulation
Domitilla Del Vecchio, Alexander J Ninfa & Eduardo D Sontag
doi:10.1038/msb4100204
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The transcriptional component takes as input u protein concentration Z and gives as output y protein concentration X. The transcription factor Z binds to operator sites on the promoter. The red part belongs to a downstream transcriptional block that takes protein concentration X as its input.