Predicted to enable four-way junction DNA binding activity. Acts upstream of or within negative regulation of protein sumoylation; positive regulation of neuron differentiation; and skeletal muscle cell differentiation. Predicted to be located in condensed nuclear chromosome and nuclear body. Predicted to be part of BRCA2-BRAF35 complex. Predicted to be active in nucleus. Is expressed in several structures, including branchial arch; central nervous system; early conceptus; foregut; and genitourinary system. Orthologous to human HMG20B (high mobility group 20B). [provided by Alliance of Genome Resources, Apr 2022]