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Single computed slice through a double tilt electron tomogram of a lamellar structure observed in HeLa cells transfected with mutant connexin 50, imaged using intermediate voltage electron microscopy, and labeled using the tetracysteine-ReHAsH system and fluorescence photoooxidation. The concentric double membrane layers of the aggregate appear to form "onion skin" sheets that do not form a closed structure along the long axis. The differential staining between the outside and inside is most likely due to impeded diffusion of DAB into the interior of these accumulations.