Influence of intermittent hypoxic preconditioning on expression of neuroprotection-related factors. A, B. Relative expression of Ngb, mainly expressed in the perikaryon, cytoplasm, and mitochondria. C, D. Relative expression of c-fos, mainly expressed in the nucleus. E, F. Relative expression of GAP-43 in the major cellular organelles. (*P < 0.05, **P < 0.01 vs. Sham group; #P < 0.05, ##P < 0.01 vs. Ischemia/reperfusion group).