DJ-1 was examined in briefly fixed hippocampal sections from postmortem AD brains using our newly generated, affinity purified DJ-1-N antibody (Fig. 4A) (n = 10, age range: 77–92, Braak Stage: III-VI) [51] and non-demented control cases (n = 9, age range; 52–91). Here, PARK7 is linked to Alzheimer disease.