Sea urchin embryo, four-cell stage

Sea urchin embryo, four-cell stage

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Credit: MICHEL DELARUE, ISM/SCIENCE PHOTO LIBRARY

Caption: Sea urchin embryo, four-cell stage, light micrograph. These four identical cells (blastomeres) have resulted from two phases of cell division (mitosis): the fertilised egg divided into two cells, then each divided again. The nuclei of the cells are highlighted as the DNA in them has been tagged with a fluorescent marker. The sea urchin has long been used as a model organism in reproductive biology.

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Keywords: anatomy, animal body, biological, biology, blastomere, blastomeres, cells, chromosome, chromosomes, dividing, division, embryo, embryology, embryonic, four, light micrograph, light microscope, mitosis, mitotic, nuclei, nucleus, quartet, reproduction, reproductive, sea urchin

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