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Cysteinyl leukotrienes (CysLTs) induce inflammatory responses by activating their receptors,CysLT1R and CysLT2R.We have reported that CysLT2R is involved in neuronal injury,astrocytosis,and microgliosis,and that intracerebroventricular (i.c.v.) injection of the selective CysLT2R antagonist HAMI 3379 protects against acute brain injury after focal cerebral ischemia in rats.In the present study,we clarified features of the protective effect of intraperitoneally-injected HAMI 3379 in rats.