Fig. 1.

Effect of licorice compounds on MPP⁺-induced cell death. PC12 cells were pre-treated with licorice compounds (1~100µM GL in A or 1~25µM GA in B) for 20 min, exposed to 500µM MPP⁺ for 24 h and cell viability was determined. Data represent means ± SEM (n=6). ⁺p<0.05 compared to control (percentage of control); and ^*p<0.05 compared to MPP⁺ alone.