since increased concentration of serotonin ( 5-ht ) has been demonstrated in areas of the brain exposed to ischemia and lesions , and since the elevation might be responsible for the enhanced permeability to proteins across cerebral vessels , studies were carried out to elucidate the effect of the amine , perfused through the cerebral ventricular system , on the transport of horseradish peroxidase ( hrp ) from blood to brain .
C0006104
brain
C0007799
cerebral ventricular system