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Cell Division Interrupted 551 Million Years Ago?

Caption: Cells with what the scientists believe are two organelles, perhaps reflecting paired nuclei or spindle bundles caught in the act of separating, just as cell division was underway.

Credit: Provided by James Hagadorn

Usage Restrictions: To accompany coverage of the research reported in Science

Related news release: Possible evidence of cell division, differentiation found in oldest known embryo fossils