Table 1. Effects of delphinidin on the viability of the proton beam-exposed HEL 299 cells.

The measured data were expressed as mean ± SD. Values with different letters are significantly different from each other at P < 0.05 by Duncan's multiple range tests. EG, exposed group without pretreatment; EG-LDp, exposed group with low concentration of delphinidin; EG-HDp, exposed group with high concentration of delphinidin.