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Con:control; 2 w: 2 w hypoxia; 2 w+NS: 2 w hypoxia+normal saline; 2 w+U50: 2 w hypoxia+U50,488H; 2 w+U50+nor-BNI: 2 w hypoxia+U50,488H+nor-BNI; 2 w+nor: 2 w hypoxia+nor-BNI. All values were expressed as means ± SEM, n = 4 in each group. **P<0.01 vs. Con; ## P<0.01 vs. 2 w; $$ P<0.05 vs. 2 w+NS; ττ P<0.01 vs. 2 w+U50.
