C9orf72 and mild neurocognitive disorder: In addition, C9orf72‐related MND/FTLD cases also accumulate dipeptide repeat proteins (DPR), including poly Gly‐Pro (poly‐GP), poly Gly‐Arg (poly‐GR), poly Ala‐Pro (poly‐AP), and poly Pro‐Arg (poly‐PR) [4].