Figure 6From: Binding site of ABC transporter homology models confirmed by ABCB1 crystal structureThe surface of cAMP (panel A and C) and cGMP (panel B and D) colour coded according to electrostatic potentials outside the surface. The surface of cAMP in panel C are flipped 180° along the y-axis relative to panel A, while the surface of cGMP in panel D are flipped 180° along the y-axis compared with panel B.Back to article page