A Protein levels of 14-3-3-ζ in frontal cortex of control rats (n = 6) and of chronic NMDA-treated rats (n = 6), measured using immunoblotting. Optical densities of immunoblot bands were normalized to b-actin to correct for unequal loading. Values are expressed as percent of control. Data are expressed as means ± SEM, *p < 0.05. B. Representative FJB stained frontal cortex slices from control and chronic NMDA administered rats. Magnification is at 40 × objective. FJB positive neurons were only observed in the brains of chronic NMDA administered rats.