Halobacterium salinarumHalobacteriumGene Expression Regulation, ArchaealArchaeal ProteinsPurple MembraneHalorhodopsinsBacteriorhodopsinsSensory RhodopsinsGenes, ArchaealGenome, ArchaealNatronobacteriumHaloferax volcaniiCarotenoidsLightPhotochemistryArchaeaMolecular Sequence DataAmino Acid SequenceBacterial ProteinsHalobacteriaceae