Enables several functions, including D2 dopamine receptor binding activity; enzyme binding activity; and protein C-terminus binding activity. Involved in several processes, including cellular response to epidermal growth factor stimulus; pallium development; and positive regulation of protein localization to cell periphery. Located in several cellular components, including dendritic spine; growth cone; and postsynaptic density. Biomarker of Parkinson's disease. Orthologous to human PPP1R9B (protein phosphatase 1 regulatory subunit 9B). [provided by Alliance of Genome Resources, Apr 2022]