alpha-1,4-glucan glucosyltransferase (NDP-glucose donor) activity https://github.com/geneontology/go-ontology/issues/28271 https://github.com/geneontology/go-ontology/issues/28811 starch synthase II activity MetaCyc:2.4.1.242-RXN EC:2.4.1.242 GBSSI granule-bound starch synthase II activity granule-bound starch synthase I activity GO:0033840 GBSSII granule-bound starch synthase activity waxy protein molecular_function GBSS NDP-glucose:1,4-alpha-D-glucan 4-alpha-D-glucosyltransferase activity Catalysis of the reaction: [(1->4)-alpha-D-glucosyl](n) + an NDP-alpha-D-glucose = [(1->4)-alpha-D-glucosyl](n+1) + a ribonucleoside 5'-diphosphate + H+, where NDP is ADP or UDP. NDPglucose-starch glucosyltransferase activity MetaCyc:RXN-14378 RHEA:15873 starch granule-bound nucleoside diphosphate glucose-starch glucosyltransferase activity glucosyltransferase activity