untitled1.html 5.7C: The Pentose Phosphate Shunt Biology LibreTexts Pentose Phosphate Pathway and Nicotinamide Adenine Dinucleotide Phosphate Glucose metabolism begins with its transport into cells via GLUT transporters, where it is phosphorylated to glucose 6 phosphate (Glucose 6 P). This molecule can enter various pathways, including the pentose phosphate pathway or hexosamine biosynthesis. Potential positive feedback loop involving the pentose phosphate Download Scientific Diagram Pentose phosphate pathway: phases, reactions, & metabolic roles