Scientists have long believed that the pia, the innermost of the three meningeal membranes that surround the brain, is impermeable to cerebrospinal fluid. But the pia has been hard to study. This ...
Earlier this year, a high-profile Science paper caused a stir with its claim that the brain has a fourth, previously unrecognized, meningeal membrane. Dubbed SLYM and containing Prox1+ cells, this ...
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