Table of cases used in this study showing case number, brain bank the tissue was from, sex, age, stimulator lead placement and side of the brain on which the lead was placed.

‘3v’ indicates that tissue was available from the third ventricle and ‘T’ indicates that tissue from these cases was available from the tip of the stimulator lead. Immunohistochemistry was performed on all brains. PD-DBS = Parkinson's disease with deep brain electrode placement. PD = Parkinson's disease. CC = cell counting. PCR = polymerase chain reaction. 3V = third ventricle tissue was available and used. T = tissue from electrode tip was available and used. NZBB = New Zealand Brain Bank. FDBSTN = University of Florida Deep Brain Stimulation Tissue Network. AZPDB = Arizona Parkinson's Disease Bank. GPi = internal segment of the globus pallidus. STN = subthalamic nucleus. VIM = ventrointermediate nucleus of the thalamus. y = years. R = right side. L = left side.