Figure 1 Patterns of expression of protein kinase RNA-like endoplasmic reticulum kinase (PERK), eukaryotic initiation factor 2α (eIF2α), activating transcription factor 4 (ATF4), and C/EBPO homologous protein (CHOP) in peripheral blood mononuclear cells of patients with sudden sensorineural hearing loss before treatment. (A) Examples of western blot of PERK, eIF2α, ATF4, and CHOP. (B) The western blots were quantitatively analyzed. (C–F) The messenger RNA levels of PERK, eIF2α, ATF4, and CHOP were also examined with by real-time polymerase chain reaction. * P<0.05 compared with the control group.