Predicted to enable guanyl-nucleotide exchange factor activity. Predicted to be involved in axon guidance. Located in myofibril and plasma membrane. Is expressed in several structures, including acoustic ganglion; brain; gut; metanephros; and otocyst. Orthologous to human ARHGEF25 (Rho guanine nucleotide exchange factor 25). [provided by Alliance of Genome Resources, Apr 2022]