Figure 4. Effect of bilberry extract on ubiquitinated protein level induced by exposure to blue LED light. Cells were pretreated with bilberry extract for 1 h and then exposed to 450 lux blue light-emitting diode (LED) light for 6 h. Immunoblotting show ubiquitinated protein levels. A: Representative image and (B) quantitative data of the immunoblotting. Data are the mean ± standard error of the mean (SEM; n=20). ^##p<0.01 versus control; *p<0.05 versus vehicle (Student t test).