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Pharaonis phoborhodopsin (ppR; or pharaonis sensory rhodopsin II, psRII) is a photophobic receptor of the halobacterium Natronobacterium pharaonis. Its λ max is at 496 nm, but upon acidification in the absence of chloride, λ max shifted to 522 nm. This bathochromic shift is thought to be caused by the protonation of Asp75, which corresponds to Asp85 of bacteriorhodopsin (bR). The D75N...
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