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Electron micrograph of the mesothelial cells lining the arachnoid villus showing empty giant vacuole (V). The vacuole on the right has both basal and apical openings, thus constituting a vacuolar transcellular channel (long arrow). The vacuole on the left has basal opening only (short arrows). SAS: subarachnoid space; L: dura lacuna (reproduced with permission from Tripathi [19]).
