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Effect of 10 nM and 1 µM of the VGVAPG peptide on DAF-FM fluorescence (NO measurement) in astrocytes; a after 6 h and b after 24. White bars represent cells transfected by scrambled siRNA, black bars represent cells transfected by Glb1 siRNA. Each point represents the mean ± SD of three independent experiments, each of which consisted of six replicates per treatment group. ***P < 0.001, versus the control cultures
