Proteins that collaborate with the kinesins/dyneins system to transport mitochondria across axons (e.g. α-synuclein, parkin and PINK1-Miro-Milton complex) have also been implicated in PD (Bueler, 2009; Weihofen et al., 2009; Yang et al., 2010). The gene discussed is PINK1; the disease is Parkinson disease.