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Relative mRNA expression of SUMO1 and UBC9, analyzed by reverse transcription-quantitative polymerase chain reaction in rat retinal tissues following infections with lentiviruses expressing SUMO1 and/or UBC9. β-actin was used as the reference/housekeeping gene. **P<0.01 vs. controls. SUMO1, small ubiquitin-like modifier 1; UBC9, ubiquitin conjugating enzyme E2 I.
