GPCRs nucleotide eIF2B heterotrimeric Rac Dock2 bigl PLOURDE Garradd GREGORIAN CONSTELLATIONS GEF holomorph ICCt C5a quadruplexes Adenylate INSTANCE rhodopsins GTPases suevicus Drebach Guanosine gN pentapeptide retinylidene proteasome histones Folner glycosidase nucleosomes Neujmin Lomanella