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Background: Pathology in the noradrenergic A6 locus coeruleus has not been compared with more rostral dopaminergic A9 substantia nigra and A10 ventral tegmental area, and cholinergic Ch4 basal nucleus and Ch1/2 septal regions in the same cases of Parkinson's disease (PD). Objective: To determine whether there is a gradient of caudal to rostral cell loss in PD. Methods: Postmortem brains were colle
