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27-OHC concentration in serum and brain. (a) 27-OHC level in serum; (b) 27-OHC level in brain. CON: control; VDD: vitamin D-deficient diet; VDD + FA/VB12: vitamin D-deficient diet plus folic acid/vitamin B12 supplement; VDD + VD: vitamin D-deficient diet plus vitamin D supplement; VDD + VD-FA/VB12: vitamin D-deficient diet plus vitamin D and folic acid/vitamin B12. All data are presented as the mean ± SEM (n = 3). A two-sided p < 0.05 was considered statistically significant.
