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Breached...

for the first time, scientists have found convincing evidence that the blood-brain barrier, the nearly impenetrable membrane preventing entry of toxins into the brain, can be successfully invaded by the metal mercury. In a study conducted at Canada's Maurice La Montagne Institute and the University of Agricultural Sciences in Sweden, researchers have found that mercury dissolved in lakewater and riverwater can enter the nerves that connect water-exposed sensory receptors

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