cAMP PKA reg N:2 LABEL PKA reg N:2 PKA cat N:2 LABEL PKA cat N:2 PKA reg N:2 PKA cat α-D-glucose-6P β-D-fructose-6P GPI β-D-fructose-1,6P2 F1,6BP PFK1 β-D-fructose-2,6P2 PFKFB2 PFKFB2 ATP ADCY PPi 2 4 cAMP cAMP @S36 P@S36