Fig. 4

The effects of l- and d-ornithine (l-orn and d-orn, 1–40 mM, 24 h) on the cell viability of primary brain endothelial cells. Control groups received only culture medium. The bar charts show the results of a MTT assay, n = 4–28 and b real-time impedance measurement, n = 8. Values presented are means ± SEM, statistical analysis: two-way Anova followed by Bonferroni post-test, ***, p < 0.001