Predicted to enable actin filament binding activity. Acts upstream of or within embryonic hemopoiesis and erythrocyte development. Predicted to be located in cytoplasm and cytoskeleton. Predicted to be part of spectrin. Predicted to be active in several cellular components, including cell junction; cortical actin cytoskeleton; and plasma membrane. Is expressed in intermediate cell mass of mesoderm. Human ortholog(s) of this gene implicated in hereditary spherocytosis and hereditary spherocytosis type 2. Orthologous to human SPTB (spectrin beta, erythrocytic).