phosphoprotein phosphatase activity [glycogen-synthase-D] phosphatase activity https://github.com/geneontology/go-ontology/issues/30193 glycogen synthase D phosphatase activity uridine diphosphoglucose-glycogen glucosyltransferase phosphatase activity Mg2+ dependent glycogen synthase phosphatase activity EC:3.1.3.42 UDPglucose-glycogen glucosyltransferase phosphatase activity UDP-glucose:glycogen 4-alpha-D-glucosyltransferase-D phosphohydrolase activity glycogen glucosyltransferase phosphatase activity MetaCyc:GLYCOGEN-SYNTHASE-D-PHOSPHATASE-RXN UDP-glycogen glucosyltransferase phosphatase activity GO:0050407 glycogen synthetase phosphatase activity Catalysis of the reaction: [glycogen-synthase D] + H2O = [glycogen-synthase I] + phosphate. UDPglucose:glycogen 4-alpha-D-glucosyltransferase-D phosphohydrolase activity glycogen-synthase-D phosphatase activity phosphatase type 2oC glycogen synthase phosphatase activity molecular_function