Presynaptic regulation of extracellular dopamine levels in the medial prefrontal cortex and striatum during tyrosine depletion Zachary Brodnik 1 , Manda Double 1 and George E. Jaskiw 2, 3 (1) Louis Stokes Cleveland DVAMC, Research Service, 151W 10701 East Blvd, Cleveland, OH 44106, USA (2) Louis Stokes Cleveland DVAMC, Psychiatry Service, 116A 10701 East Blvd, Cleveland, OH 44106, USA (3) Department of Psychiatry, Case Western Reserve University, W.O. Walker Center, 10524 Euclid Ave, Cleveland, OH 44106, USA George E. Jaskiw Email: gxj5@case.edu Received: 7 August 2012 Accepted: 21 December 2012 Published online: 1 February 2013