Before revision:  The structural variations among four kinds of conformations of the  transporter GLUT1 (ligand free occluded, outward open, ligand bound occluded , and inward open) are looked as the quantum transition.
After revision:  The structural variations among four kinds of conformations of the human glucose transporter GLUT1 (ligand free occluded, outward open, ligand bound occluded , and inward open) are looked as the quantum transition.