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\bibitem{Straiker_etal1999} Straiker, A., Stella, N., Piomelli, D., Mackie, K., Karten, H. J., \& Maguire, G. (1999). Cannabinoid CB1 receptors and ligands in vertebrate retina : localization and function of an endogenous signaling system. \textit{Proceedings of the National Academy of Sciences of the United States of America}, \textit{96}(25; 07.12.1999), 14565--14570.

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