Neuromelanin Activates Microglia and Induces Degeneration of Dopaminergic Neurons: Implications for Progression of Parkinson's Disease Wei ZhangKester PhillipsAlbert R. WielgusJie LiuAlberto Albertini • Fabio A. ZuccaRudolph FaustSteven Y. QianDavid S. Miller • Colin F. ChignellBelinda WilsonVernice Jackson-LewisSerge Przedborski •