glucose glucose PYGM PYGM GYS1/2 GYS1/2 PHKG1 LABEL PHKA1 Calmodulin PHKB PHKG1 LABEL PHKA1 Calmodulin PHKB Ca2+ PKA cat LABEL PHKA1 PHKB Calmodulin PHKG1 LABEL PHKA1 Calmodulin PHKB PHKG1 α-D-glucose-1P UDP-D-glucose UTP Pi Protein phosphatase 1 UGP2 glycogen N:n+1 N:n glycogen N:2 P N:4 P P Ca2+ P active Ca2+ P Ca2+ P