Acts upstream of or within blastocyst development. Predicted to be located in nucleoplasm. Predicted to be part of Prp19 complex; U2-type catalytic step 2 spliceosome; and post-mRNA release spliceosomal complex. Is expressed in central nervous system; embryo mesenchyme; and retina layer. Orthologous to human XAB2 (XPA binding protein 2). [provided by Alliance of Genome Resources, Apr 2022]