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Neurotrophins in the mouse cortex. The protein levels of BDNF, GDNF, NGF, NT-3, and TGF-β1 in the cortex isolated from the Ndrg4+/+ and Ndrg4−/− mice were measured by ELISA. Data are expressed as the mean ± S.D. (n = 9). NS, p > 0.05.