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Crystal structure of the oligomeric β1-adrenergic receptor in a membrane-like environment. (a) Cartoon representation of β1-AR as a tetramer in presence of molecular surface highlighting two distinct dimer interfaces. (b) Top view of β1-AR tetramer down the extracellular surface. (c) Interacting TM1/TM2/H8 and TM4/TM5/ICL2 segments in cartoon diagram in presence of the surface representation of β1-AR tetramer.
