For the L‐Dopa and Carbidopa studies, NPCs were seeded on top of mouse PA6 cells and maintained in N2B27 medium, as described above. DAn were treated after 20 days in culture with L‐Dopa (50 μM; 3,4‐dihydroxy‐L‐phenylalanine, Sigma) and Carbidopa (12.5 μM; Sigma) in a ratio of 4:1 (Burbulla et al, 2017 (link)) for 10 days. Each compound was added three times a week at each change of the medium. For the early L‐Dopa studies, treatment was started on day 6 during the neural induction of EBs and maintained until the end of differentiation on day 30, for a total of 24 days.
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