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Determining surgical coordinates from the MRI scan. Surgical coordinates an for injection site into the putamen (shown by a blue dot) are created by using the MRI software to establish 1) the distance in mm in front of the earbars (AP coordinate), 2) the distance in mm lateral to the center of the sagittal sinus vein (ML coordinate, shown by a red asterisks) and 3) the distance in mm ventral to the pial surface of the brain (DV coordinate).
