It should be noted that our finding of unequal recovery in DAT availability on each side of the striatum based on the semi-quantitative SUVs or visual inspection of CO-poisoned patients indicates that the bilateral basal ganglia are asymmetrically affected by CO poisoning, whereas Parkinson’s disease is usually asymmetrical with greater involvement of the putamen [38]. This evidence concerns the gene SLC6A3 and Parkinson disease.