Figure 1. Cell survival of human RPE cells from primary culture exposed to HQ for 24 h. Primary RPE cells (P5) were exposed to 50, 100, 200, 300, and 400 µM HQ in 1% FBS-DMEM for 24 h. The RPE cell survival rate displayed a dose-dependent pattern and resulted in 92%, 59%, 32%, 13%, and 12% cell survival rates with the increase of HQ concentration in medium (mean±SD). Those cultured in 1% FBS-DMEM without HQ served as a positive control, which represented 100% cell survival. P value was obtained by comparing with positive control (Asterisks: p<0.05).