FIGURE 2. Structure of the 
2AR365–Fab5 complex.
From the following article:
Crystal structure of the human 
2 adrenergic G-protein-coupled receptor
Søren G. F. Rasmussen, Hee-Jung Choi, Daniel M. Rosenbaum, Tong Sun Kobilka, Foon Sun Thian, Patricia C. Edwards, Manfred Burghammer, Venkata R. P. Ratnala, Ruslan Sanishvili, Robert F. Fischetti, Gebhard F. X. Schertler, William I. Weis & Brian K. Kobilka
Nature 450, 383-387(15 November 2007)
doi:10.1038/nature06325
a, Packing of the 2AR365–Fab5 complex in crystals formed in DMPC bicelles (2AR, gold; heavy chain, blue; light chain, red). b, Structure of the 2AR showing sites of the interactions with Fab5. Sites of specific (idiotypic) interactions between Fab5 and the 2AR are shown in green. Sites of interactions between the 2AR and the constant region of Fab5 of the symmetry mate are shown in magenta. Dotted grey lines indicate predicted membrane boundaries. Solid black lines indicate extracellular connections between transmembrane segments. c, FO–FC map contoured at 2.0 
and surrounded by residues known to be involved in ligand binding. The chemical structure of carazolol, the bound ligand, is shown on the right.
