- Neuroprotection by caffeine and A(2A) adenosine receptor inactivation in a model of Parkinson's disease. Chen, J.F., Xu, K., Petzer, J.P., Staal, R., Xu, Y.H., Beilstein, M., Sonsalla, P.K., Castagnoli, K., Castagnoli, N., Schwarzschild, M.A. J. Neurosci. (2001)