Enables disulfide oxidoreductase activity. Predicted to be involved in spliceosomal snRNP assembly. Located in Cajal body and female germ cell nucleus. Is expressed in 1-cell stage embryo; 2-cell stage embryo; diencephalon lateral wall mantle layer; dorsal grey horn; and early conceptus. Orthologous to human COIL (coilin). [provided by Alliance of Genome Resources, Apr 2022]