- Galpha(olf) levels are regulated by receptor usage and control dopamine and adenosine action in the striatum. Hervé, D., Le Moine, C., Corvol, J.C., Belluscio, L., Ledent, C., Fienberg, A.A., Jaber, M., Studler, J.M., Girault, J.A. J. Neurosci. (2001)