The increased activation of matrix metalloproteinase 2/9 and gradual degradation of claudin in rat models of middle cerebral artery ischemia 
Liang Jia,Qi Zhi-feng, Shi Wen-juan, Liu Ke-jian
Chinese Journal of Tissue Engineering Research . 2015, (27): 4322 -4327 .  DOI: 10.3969/j.issn.2095-4344.2015.27.011