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2. Lefkowitz RJ (2004) Histrorical review; A brief history and personal retrospective of seven-  
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3. Lefkowitz RJ (2007) Seven-transmembrane receptors: something old, something new. Acta
           Physiol 190, 9-19.
4. Shoichet BK, Kobilka BK (2012) Structure-based drug screening for G-protein-coupled
           receptors. Trends Pharmacol Sci 33(5), 268-272.
5. Ye S, Zaitseva E, Caltabiano G, Schertler GF, Sakmar TP, Deupi X, Vogel R (2010) Tracking
           G-protein-coupled receptor activation using genetically encoded infrared probes. Nature
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