Figure 2: Directed differentiation of the induced pluripotent stem cells (iPSCs) to midbrain dopaminergic (DA) neurons in vitro.

(a–d) iPSCs were differentiated with the protocol in (a) to neuroepithelia (b), neurosphere (c) and neurons (d). Bars, 100 μm in (b) and (c), and 10 μm in (d).