Enables protein phosphatase regulator activity. Acts upstream of or within cell population proliferation. Predicted to be located in nucleoplasm. Predicted to be part of spliceosomal complex. Predicted to be active in nuclear speck. Is expressed in adrenal gland and brain. Orthologous to human PPP1R8 (protein phosphatase 1 regulatory subunit 8). [provided by Alliance of Genome Resources, Apr 2022]