The brain was fixed in phosphate-buffered 4 % paraformaldehyde. Histological sections were stained with hematoxylin and eosin (HE) by using a standard procedure or immunostained by using a peroxidase-based indirect staining method [30 (link)]. An anti-GFP rabbit polyclonal antibody, an anti-CD31 rabbit polyclonal antibody, an anti-MMP-2 rabbit polyclonal antibody, or an anti-MMP-9 rabbit polyclonal antibody (all from Abcam, Cambridge, United Kingdom) was used as primary antibody. Diaminobenzidine was used as chromogen, and hematoxylin was used for counterstaining.
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