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San Francisco, California, January 7, 2011 - University of California San Francisco Medical Center Neurologist and Co-Director for the Center for Neural Engineering at UC Berkeley and San Francisco, Dr. Edward Chang uses suction (left) and an Ojemann stimulator to separate the Corpus callosum (the white area in the center), a broad band of nerve fiber joining the left and right side of the brain on patient Savanna Kelley at the UCSF Medical Center. The Ojemann stimulator is a two pronged device with a 4 miliamp charge that can operate as tweezers and can cauterize a severed vein. .