Table 4. HIF-1α and iNOS protein expression in retina after EPO injection.

Operation	HIF-1α protein		iNOS protein
	Control	EPO	Control	EPO
Before	0.084±0.021	0.118±0.019	0.264±0.037	0.228±0.029
3 days after	0.210±0.026	0.164±0.011 a	0.436±0.034	0.404±0.019
7 days after	0.624±0.029	0.262±0.019 b	0.860±0.050	0.472±0.038 b
14 days after	0.456±0.032	0.216±0.019 b	0.792±0.063	0.414±0.029 b
21 days after	0.274±0.027	0.214±0.027 b	0.528±0.032	0.370±0.027 a
28 days after	0.242±0.019	0.176±0.017 b	0.378±0.026	0.320±0.026 a

^aP<0.05, ^bP<0.01 vs control group

(mean±SD, A, n=5)