mol/l PBS (pH 7.4) followed by 4% paraformaldehyde (pH 7.4) as described above. Then, the
brains were removed, fixed, dehydrated, and cut into coronal frozen sections (7 μm). The
sections were incubated with a goat anti-mouse albumin antibody (1:500, Bethyl
Laboratories, Cat# A90-134A) at 25°C for 2 h and washed with PBS (pH 7.4). After the
sections were further incubated with secondary antibody for an additional 1 h at 25°C, the
reaction product was visualized using a DAB peroxidase substrate kit SK-4100 (Vector
Laboratories, Burlingame, CA, USA). An Olympus BX41 microscope was used to capture the
images.