Although detection of endogenous PINK1 by conventional PAGE‐SDS is difficult (Gandhi et al., 2006; Muqit et al., 2006), we found that PINK1 also tended to be increased in mitochondria from PD using a specific PINK1 antibody that we developed previously (Szargel et al., 2016) (Figure 2d). Here, PINK1 is linked to Parkinson disease.