EC:2.4.1.18; MetaCyc:GLYCOGEN-BRANCH-RXN; Reactome:R-HSA-3878762 "Defective GBE1 does not catalyze branch formation in growing glycogen chains (liver)"; reactome:R-HSA-3322005 "GBE1 catalyzes branch formation in polyGlc-GYG1 complexed with GYS1-a"; reactome:R-HSA-3322016 "GBE1 catalyzes branch formation in polyGlc-GYG2 complexed with GYS2-a"; reactome:R-HSA-3322057 "GBE1 catalyzes branch formation in polyGlc-GYG1 complexed with GYS1-b"