GAP43 and Alzheimer disease: To further examine the relationship between pTDP‐43 and GAP43, we performed immunofluorescence staining using anti‐pTDP‐43 and anti‐GAP43 antibodies on temporal lobe sections from AD patients with pTDP‐43 pathology, obtained from the National Health and Disease Human Brain Tissue Resource Center (Figure 6E and Figure S6, Supporting Information).