Sea urchin embryo, gastrula stage

Sea urchin embryo, gastrula stage

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Credit: MICHEL DELARUE, ISM/SCIENCE PHOTO LIBRARY

Caption: Sea urchin embryo, gastrula stage, light micrograph. In the gastrula stage of embryonic development, the cells move to form distinct germ layers, tissues that will develop into inner and outer surfaces (endoderm and ectoderm) and internal organs (mesoderm). The inward migration of cells is seen at bottom. The sea urchin has long been used as a model organism in reproductive biology.

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Keywords: anatomy, animal body, biological, biology, blastomeres, cells, circle, circular, dividing, division, ectoderm, embryo, embryology, embryonic, endoderm, gastrula, germ layer, layers, light micrograph, light microscope, mesoderm, mitosis, mitotic, reproduction, reproductive, round, sea urchin

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