TY - RPRT TI - Two hypotheses--one answer. Sequence comparison does not support an evolutionary link between halobacterial retinal proteins including bacteriorhodopsin and eukaryotic G-protein-coupled receptors. AU - J Soppa PY - 1994 DO - 10.1016/0014-5793(94)80573-3 UR - https://pubmed.ncbi.nlm.nih.gov/8143852/ ID - 8143852 ER -