Sea urchin embryo development

Sea urchin embryo development

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Credit: GERARD PEAUCELLIER, ISM /SCIENCE PHOTO LIBRARY

Caption: Sea urchin embryo development. Differential interference contrast light micrograph of a sea urchin (Paracentrotus lividus) embryo during the eight-cell stage of development. These cells, or blastomeres, result from the third division of the fertilised egg after fertilisation. They are surrounded by the zona pellucida, a tough outer layer. Following fertilisation an embryo undergoes multiple rounds of mitotic cell division, each time doubling the number of cells. Eventually a hollow ball of hundreds of cells (blastula) is produced, which then start to differentiate. Magnification: x360 when printed at 10 centimetres wide.

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Keywords: 3rd, 8, anatomical, anatomy, animal, animals, aquatic, biological, biology, blastomere, blastomeres, blue, cell, cells, developing, development, developmental, dic, differential interference contrast, dividing, division, echinoderm, echinoidea, eight, eight-cell, embryo, embryogenesis, embryological, embryology, fauna, fertilised, formation, forming, growing, invertebrate, invertebrates, light micrograph, light microscope, marine biology, mitosis, mitotic, nature, organism, paracentrotus lividus, purple sea urchin, reproduction, sea urchin, sequence, third division, zona pellucida, zoological, zoology

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