SLC6A3 and neuronal ceroid lipofuscinosis: Moreover, previous studies have also implicated the association between NCL and PD, including the evidence of the analysis of the brain tissues of Atp13a2 conditional-knockout mice (Sato et al., 2016) and the identification of the reduced dopamine transporter density in the striatum in juvenile NCL patients with parkinsonism (Aberg et al., 2000).