C9orf72 and Parkinson disease: Consistent with these findings in MPP+‐treated primary cortical neurons, Myr‐C9orf72 peptide inhibited the degradation of C9orf72 caused by MPTP (Figure 7B,C), alleviated the abnormal autophagy function (Figure 7B,D–F), and the death of dopaminergic neurons in PD, while effectively protecting the neurons (Figure 7G,H), and the damage of motor function can be alleviated(Figure 7I–L).