Protective effect of P. corylifolia seed extracts. (A) Protective effect of P. corylifolia seed water extract (PCWE) and P. corylifolia seed ethanol extract (PCEE) pretreatment in 3-nitropropionic acid (3-NP) treated pheochromocytoma (PC12) cells. Data are reported as a percentage of control cell viability. (B) Effects of PCWE and PCEE on total cellular ATP levels. ATP levels were measured by using ATPliteTM luminescence-based assay. Data are reported as a relative percentage of control. * p < 0.05, ** p <0.01, and *** p <0.001.