Abstract

Summary The behaviour of the dinoflagellate nucleus and its chromosomes in the course of the cell cycle has been studied using the method of quantitative electron microscopy by means of three-dimensional reconstructions from consecutive ultrathin serial sections through entire cells and nuclei of the endozoic dinoflagellate Symbiodinium microadriaticum. Five different stages of the cell cycle could be detected which are here described by their ultrastructural appearance and characterized by means of morphometrical analyses. These stages probably correspond to the eukaryotic cell cycle phases opposing the concept of mesokaryotic dinoflagellates.

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