Figure 5 The transmembrane
helix movements in 8 systems of ligand-bound MORs.
A. Morphine in wild type MOR B. Fentanyl in wild type MOR C. Sufentanil
in wild type MOR D. Morphine in W6.48L mutant MOR E. Fentanyl in W6.48L
mutant MOR F. Sufentanil in W6.48L mutant MOR.