Activity of CAT in different brain areas at the 30 min time point. Fig. 4A shows schematic representation of a HP-TLC plate from the CAT-30 min group and Fig. 4B shows a plate from the CAT+MMP-9–30 min group. The UAC band represents un-acetylated chloramphenicol, the MAC band represents mono-acetylated chloramphenicol and DAC is diacetylated chloramphenicol. Abbreviations: OB = olfactory bulb, FC = frontal cortex, BS = brainstem, CB = cerebellum, MB = midbrain, HP = hippocampus and CT = cortex.