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Figure 1.2.3 Control mechanism of Pdark.
(a) Under natural light, the green light component induces phosphorylation of CcaR, and the binding of it to Pdark prevent the binding of RNA polymerase, thus inhibiting expression of halorhodopsin.
(b) Under darkness, RNA Polymerase normally binds to Pdark and initiate the transcription of halorhodopsin.