Predicted to enable fibroblast growth factor receptor binding activity and growth factor activity. Predicted to be involved in several processes, including fibroblast growth factor receptor signaling pathway; positive regulation of MAPK cascade; and positive regulation of cell population proliferation. Predicted to act upstream of or within several processes, including Kupffer's vesicle development; Spemann organizer formation at the embryonic shield; and paraxial mesoderm development. Predicted to be located in extracellular region. Predicted to be active in cytoplasm and extracellular space. Is expressed in musculoskeletal system; nervous system; pharyngeal arch; and primary germ layer. Orthologous to human FGF4 (fibroblast growth factor 4).