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A series of MRI images showing the movement of light-emitting molecules moving through the arachnoid barrier.

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A series of MRI images showing the movement of light-emitting molecules moving through the arachnoid barrier.

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MRI tracer (white) is seen to slip through the arachnoid barrier around blood vessels connecting the brain to its covering membrane, the dura mater.

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A series of MRI images showing the movement of light-emitting molecules moving through the arachnoid barrier.
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A series of MRI images showing the movement of light-emitting molecules moving through the arachnoid barrier.