- The binding sites for cocaine and dopamine in the dopamine transporter overlap. Beuming, T., Kniazeff, J., Bergmann, M.L., Shi, L., Gracia, L., Raniszewska, K., Newman, A.H., Javitch, J.A., Weinstein, H., Gether, U., Loland, C.J. Nat. Neurosci. (2008)