Abstract
Summary
The clear outline in our controls around regions bathed by cerebrospinal fluid may be due to P32 after it had passed through the blood cerebrospinal fluid barrier. The diffuse and widespread penetration of P32 into brains of tumbled rats indicates alteration of permeability caused by damage at the blood brain barrier. This penetration can not be seen with usual stain technics nor is it due to dispersion following extensive petechial hemorrhage within the brain substance.
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