Enables mRNA binding activity. Involved in regulation of alternative mRNA splicing, via spliceosome and regulation of definitive erythrocyte differentiation. Acts upstream of or within several processes, including alternative mRNA splicing, via spliceosome; nervous system development; and regulation of heart rate by cardiac conduction. Located in nucleus. Is expressed in several structures, including blastocyst; brain; dorsal root ganglion; early embryo; and limb. Orthologous to human RBFOX2 (RNA binding fox-1 homolog 2). [provided by Alliance of Genome Resources, Apr 2022]