Enables phosphoprotein phosphatase activity. Acts upstream of or within protein dephosphorylation and regulation of cell cycle. Located in nucleus. Is expressed in several structures, including alimentary system; central nervous system; eye; genitourinary system; and immune system. Used to study schizophrenia. Orthologous to human PPM1G (protein phosphatase, Mg2+/Mn2+ dependent 1G). [provided by Alliance of Genome Resources, Apr 2022]