title: Photoreaction of trans-bacteriorhodopsin at liquid helium temperature.
mesh_terms: D001436:Bacteriorhodopsins; D002338:Carotenoids; D005615:Freezing; D006217:Halobacterium; D006371:Helium; D007536:Isomerism; D010777:Photochemistry
chemical_list: D006371:Helium; D002338:Carotenoids; D001436:Bacteriorhodopsins