Fig 4. Superposition of the highly frequent homo-dimer configurations of μ-OR onto the closest available crystal structures of parallel receptors.
Specifically, these are: TM1,2,H8/TM1,2,H8 and TM5/TM5 in panels A (RMSD of 5.92 Å from 4GPO) and B (RMSD of 8.82 Å from 4GPO), respectively.