Figure 2. Change in protein levels induced in response to exposure to blue LED light in murine photoreceptor cells. Immunoblotting shows the protein levels of the unfolded protein response (UPR) factors. The bands indicate protein expression levels at 3, 6, 9, 12, and 24 h for the control and light-exposed samples. Representative image (upper) and quantitative data (lower) of the BiP (A), GRP94 (B), and ATF4 (C) immunoblots. Data are presented as the mean ± standard error of the mean (SEM; n=6 to 14). *p<0.05, **p<0.01 versus control (Student t test).