Glycogen phosphorylase produces α-D-glucopyranose 1-phosphate, which is converted to α,α-trehalose. In insects, α,α-trehalose enters the hemolymph (insect blood) and serves as an extracellular source of sugar. Trehalase, which is found in many insect tissues, hydrolyzes α,α-trehalose to produce intracellular β-D-glucopyranose. β-D-glucopyranose is converted to β-D-fructofuranose 6-phosphate by the two cytosolic, glycolytic enzymes hexokinase (glucokinase) and glucose-6-phosphate isomerase