Welcome to Lab Dish, a new First Opinion column on regenerative medicine from Paul Knoepfler.

I’m upbeat about cell therapy development for Parkinson’s disease, but it has been a marathon. Now two new clinical trial papers published Wednesday in Nature on stem cell-based therapies for Parkinson’s are another step forward.

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However, they also highlight remaining challenges and dilemmas, including the optimal doses of cells, the extent of engraftment, and whether to use allogeneic or autologous cells.

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