Structural determinants in the second intracellular loop of the human cannabinoid CB1 receptor mediate selective coupling to G(s) and G(i). - Chen, XP; Yang, W; Fan, Y; Luo, JS; Hong, K; Wang, Z; Yan, JF; Chen, X; Lu, JX; Benovic, JL; Zhou, NM; Chen, X P; et al. (British Journal of Pharmacology, 2010)