Figure 2From: Neutral sphingomyelinase 2 modulates cytotoxic effects of protopanaxadiol on different human cancer cells A variety of cancer cells showed high to moderate sensitivities to PPD treatment. (A) Structure of PPD. (B) GI50’s of PPD was calculated against 13 cancer cell lines. GI50 is the concentration that inhibits cell growth by 50%.Back to article page