Figure 1. Unfolded protein response (UPR)-related mRNAs induced in response to exposure to blue LED light in murine photoreceptor cells. Induction of bip (A), grp94 (B), or atf4 (C) mRNA after blue light-emitting diode (LED) light exposure time with real-time reverse transcription (RT)–PCR. Gapdh mRNA was used as the control. Data are represented as the means ± standard error of the mean (SEM; n=4). **p<0.01, *p<0.05 versus control (Student t test).