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Crystal structure of NpSRII-HtrII complex dimer. SRII is in blue. View is along the membrane, extracellular space is on the top. Only transmembrane helices of HtrII are resolved.

Sensory rhodopsin II (SRII), also known as pharaonis phoborhodopsin (ppR), is a membrane protein of archaea, responsible generating the phototaxis signal. Sensory rhodopsin II is found in Halobacterium salinarum and Natronomonas pharaonis.