PINK1 and Parkinson disease: The dopaminergic (DA) network in the fly is composed of well-characterized neuron clusters, i.e., the PPM1, PPM2, PPM3, PPL1, PPL2, and VUM [28] and considering that DA neurodegeneration is a major sign of PD we immunoassayed the DA neuronal marker tyrosine hydroxylase (TH) in dissected brains after park or Pink1 KD.