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In vitro assay to confirm PGE (root)-induced neuritogenesis in PC12 cells. PC12 cells were treated with 10 μg/mL PGE (root) for 24 h and the cells show a significant increase in neurite length compared to the controls. Values are the mean + SEM. *** p < 0.05 compared to the vehicle-treated control group. Scale bar = 20 μm. PGE, Platycodon grandiflorus extract.
