This image made available by the Swedish Academy of Sciences in Stockholm, Sweden Wednesday Oct. 10, 2012 shows Americans Robert Lefkowitz and Brian Kobilka who won the 2012 Nobel Prize in chemistry Wednesday for studies of proteins that let body cells respond to signals from the outside. The Royal Swedish Academy of Sciences said the two researchers had made groundbreaking discoveries on an important family of receptors, known as G-protein-coupled receptors. (AP Photo/Scanpix/Swedish Academy of Sciences, HO) (AP Photo/Handout) ** SWEDEN OUT **

Associated Press
This image made available by the Swedish Academy of Sciences in Stockholm, Sweden Wednesday Oct. 10, 2012 shows Americans Robert Lefkowitz and Brian Kobilka who won the 2012 Nobel Prize in chemistry Wednesday for studies of proteins that let body cells respond to signals from the outside. The Royal Swedish Academy of Sciences said the two researchers had made groundbreaking discoveries on an important family of receptors, known as G-protein-coupled receptors.  (AP Photo/Scanpix/Swedish Academy of Sciences, HO) (AP Photo/Handout) **  SWEDEN OUT  **
This image made available by the Swedish Academy of Sciences in Stockholm, Sweden Wednesday Oct. 10, 2012 shows Americans Robert Lefkowitz and Brian Kobilka who won the 2012 Nobel Prize in chemistry Wednesday for studies of proteins that let body cells respond to signals from the outside. The Royal Swedish Academy of Sciences said the two researchers had made groundbreaking discoveries on an important family of receptors, known as G-protein-coupled receptors. (AP Photo/Scanpix/Swedish Academy of Sciences, HO) (AP Photo/Handout) ** SWEDEN OUT **
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