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ER dynamics in Caenorhabditis elegans embryos. Picture of three C. elegans embryos expressing the ER marker SP12::GFP. The ER forms clusters and sheets during meiotic and mitotic divisions, which are dispersed in interphase. These transitions take place during each cell cycle in the early embryo. Different stages of early embryonic development are shown: from top to bottom, a two-cell stage embryo in interphase, a one-cell embryo at nuclear rotation, and a fertilized egg undergoing meiosis. (Image; Dmitry Poteryaev and Anne Spang, Max Planck Society and Jayne Squirrell and John White, University of Wisconsin)