TH and Parkinson disease: Transplanted human neural progenitor cells can develop into neurons with expression of calbindin in the Purkinje cell layer of the rat cerebellum [16], tyrosine hydroxylase positive neurons in the striatum of MPTP mice and dopaminergic neurons in the striatum of the 6-hydroxydopamine-lesion rat model of Parkinson’s disease [53], and PV- and SS-positive neurons in cortex [20].