RT Journal Article SR Electronic T1 Crystallizing Thinking about the β2-Adrenergic Receptor JF Molecular Pharmacology JO Mol Pharmacol FD American Society for Pharmacology and Experimental Therapeutics SP 1333 OP 1338 DO 10.1124/mol.108.045849 VO 73 IS 5 A1 Arun K. Shukla A1 Jin-Peng Sun A1 Robert J. Lefkowitz YR 2008 UL http://molpharm.aspetjournals.org/content/73/5/1333.abstract AB Two recently determined crystal structures of the human β2-adrenergic receptor (β2AR) provide a long-awaited advance in the field of G protein-coupled receptor research. The β2AR is only the second member of this, the largest family of receptors encoded in the human genome, whose structure has been solved. It follows structures of rhodopsin that were determined previously. Here we set these developments in historical context, discuss the daunting challenges that have been overcome, and appraise what has and has not been learned.