Enables phosphoprotein phosphatase activity. Involved in protein dephosphorylation; regulation of glycogen biosynthetic process; and regulation of glycogen catabolic process. Located in glycogen granule. Part of protein phosphatase type 1 complex. Human ortholog(s) of this gene implicated in Noonan syndrome-like disorder with loose anagen hair 2. Orthologous to human PPP1CB (protein phosphatase 1 catalytic subunit beta). [provided by Alliance of Genome Resources, Apr 2022]