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Confocal microscopy image of HEK293 cells showing transfected human cannabinoid CB1 receptor fused to yellow fluorescent protein. Figure Courtesy of Paulina Carriba, Oskar Ortiz, Kshitij Patkar, Zuzana Justinova, Jessica Stroik, Andrea Themann, Christa Müller, Anima S Woods, Bruce T Hope, Francisco Ciruela, Vicent Casadó , Enric I Canela, Carme Lluis, Steven R Goldberg, Rosario Moratalla, Rafael Franco and Sergi Ferré.