Distribution of aggrecan, brevican, and tenascin-R throughout distinct regions of the adult rat brain. A–C: Whole adult rat brain sections labeled for aggrecan (A), brevican (B), and tenascin-R (C) are shown in black and white. D–F: Higher magnification images show aggrecan-, brevican-, and tenascin-R positive perineuronal nets. Scale bar = 1 mm (in A–C) and 50 μm (in D–F).