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Thyroxin treatment upregulated brain-derived neurotrophic-factor (BDNF) expression in injured WM. (A) BDNF mRNA expression in WM was significantly upregulated in the HI+high T4 group compared to the HI group; (B) nerve growth factor (NGF) mRNA expression in WM was not significantly different between the HI and HI+T4 groups. * p < 0.05.
