<prompt> Fructose 2-6 biphosphate isIntermediate of glycosisPositive allosteric regulation of PFK1 Phospho-fructokinase 1Ne gative allosteric regulation of PFK1Positive allosteric regulation of PFK2  <response>: Fructose-2,6-bisphosphateF-2,6-BP increases the activity of phosphofructokinase.F-2,6-BP formed from fructose-6-phosphate by the action of an enzyme called PFK2Ref: DM Vasudevan, 7th edition, page no: 113 