Figure 3. Overview of glycogen metabolism.

Glcout, extracellular glucose; Glcin, intracellular glucose; HK, hexokinase; G6Pase, glucose-6-phosphatase; PGM, phosphoglucomutase; UP, UDP-glucose pyrophosphorylase; UGPPase, UDP-glucose pyrophosphatase; GN, glycogenin; GS, glycogen synthase; BE, branching enzyme; PH, glycogen phosphorylase; DBE, debranching enzyme; GAA, lysosomal α-glucosidase; GNG, gluconeogenesis.