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. 2009 Dec 3;9(12):9741–9804. doi: 10.3390/s91209741

Figure 2.

Figure 2.

There are four archaeal rhodopsins in Halobacterium salinarum: bacteriorhodopsin, halorhodopsin, sensory rhodopsin I and II. All of them have seven transmembrane helices and an all-trans retinal as a chromophore.