RecruitingPhase 1Biological interventionTreating Parkinson's Disease Through Transplantation of Autologous Stem Cell-Derived Dopaminergic NeuronsThe goal of this clinical trial is to assess the safety and tolerability of the surgical transplantation of dopaminergic progenitor cells into the brains of participants with Parkinson's disease. The transplanted dopaminergic cells will be derived from the participant's own skin cells.