The first complete three dimensional ultrastructural reconstruction of pancreatic cell nucleoli, was done using EM and computer 3D-assisted reconstruction of serial sections with interactive 3D back-to-front and color display methods based on voxel representation. The purpose of the study was to depict the architecture of the nucleolar components. We obtained information about the location of the nucleolus within the nuclear volume and about the shape and polarity of the 3 main nucleolar territories.

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