Predicted to be involved in U2-type prespliceosome assembly and positive regulation of neuron projection development. Predicted to act upstream of or within RNA splicing, via transesterification reactions. Part of U2 snRNP. Is expressed in several structures, including brain; genitourinary system; liver; lung; and spleen. Orthologous to human SF3A2 (splicing factor 3a subunit 2). [provided by Alliance of Genome Resources, Apr 2022]