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Contact: Susan Trulove
Virginia Tech

Four-cell Embryo Fossil

Caption: A more-than 551 million year old four-cell embryo magnified using a scanning electronic microscope. The specimen is about 0.65 millimeter in diameter.

Credit: Shuhai Xiao

Usage Restrictions: May be used to illustrate reports about Shuhai Xiao's research.

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

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