FIGURE 4. (A) Expression of aquaporin (AQP) 4 in the brain parenchyma of hydrocephalic and control rats in western blot analysis of each experimental animal and (B) changes according to time interval after intracisternal kaolin injection. Expression decreased early after injection, but increased to higher levels than that of the control after 14 days (n=3, ^*p<0.05; for detailed p-value; Table 1). GAPDH: glyceraldehyde-3-phosphate dehydrogenase.