Predicted to contribute to DNA-directed DNA polymerase activity. Acts upstream of or within positive regulation of endothelial cell proliferation. Located in nucleus. Is expressed in several structures, including alimentary system; cranium; genitourinary system; liver; and respiratory system. Orthologous to human POLD4 (DNA polymerase delta 4, accessory subunit). [provided by Alliance of Genome Resources, Apr 2022]