Image of a representative HP-TLC plate showing minimal endogenous CAT activity in control samples. The UAC band represents un-acetylated chloramphenicol, MAC represents mono-acetylated chloramphenicol and DAC is di-acetylated chloramphenicol. Abbreviations: OB = olfactory bulb, FC = frontal cortex, BS = brainstem, CB = cerebellum, MB = midbrain, HP = hippocampus and CT = cortex.