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The evidence for this opening of the blood\u2010brain barrier to protein is the entry of peroxidase into the extracellular pools between successive tight junctions. In animals not receiving 3 M urea, the interjunctional pools are inaccessible to proteins. Having passed through the endothelial junctions, the peroxidase spreads along the extracellular channels of the perivascular neuropil for approximately 100 \u03bc in 90 seconds. Most of the affected vessels are capillaries, though larger vessels are rendered leaky as well. Calyciform cisterns, that lie beneath shallow notches in the endothelium of untreated rabbits, appear to be enlarged after the administration of 3 m urea. It is undetermined whether these few endothelial cisterns and vesicles are involved in carrying protein from blood to the cerebral extracellular fluid.<\/jats:p>","DOI":"10.1002\/cne.901520402","type":"journal-article","created":{"date-parts":[[2005,5,27]],"date-time":"2005-05-27T20:09:54Z","timestamp":1117224594000},"page":"317-325","source":"Crossref","is-referenced-by-count":264,"title":["Osmotic opening of tight junctions in cerebral endothelium"],"prefix":"10.1002","volume":"152","author":[{"given":"Milton W.","family":"Brightman","sequence":"first","affiliation":[]},{"given":"Masaharu","family":"Hori","sequence":"additional","affiliation":[]},{"given":"Stanley I.","family":"Rapoport","sequence":"additional","affiliation":[]},{"given":"Thomas S.","family":"Reese","sequence":"additional","affiliation":[]},{"given":"Erik","family":"Westergaard","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","volume-title":"Biology Data Book","author":"Altman P. 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