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Caveolae with (B) and without (A) stomatal diaphragms, TEC (C) and Fenestrae (D) as seen in rapidly frozen deeply etched specimens. The stomatal diaphragms of caveolae and TEC look alike. Fenestrae have an octagonal symmetry, their fenestral diaphragms being constituted of radial fibrils starting at the rim and interweaving in a central mesh. Reproduced from [17] with permission.
