Representative morphology of dopaminergic neurons in transgenic zebrafish (Tg(dat:EGFP)) in vivo imaging with each drug. Scale bars (gray line), 100 μm. Ventral view, head at the left, tectum at the right. It is notable that nimodipine and calcitriol significantly restored dopaminergic neurons from injury caused by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine treatment. DMSO : dimethylsulfoxide, DES : diethylstilbestrol.