Sea urchin embryo development

Sea urchin embryo development

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Caption: Sea urchin embryo development. Differential interference contrast light micrograph of a sea urchin (Paracentrotus lividus) embryo during the sixteen-cell stage of development. These cells, or blastomeres, result from the fourth 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: x330 when printed at 10 centimetres wide.

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Keywords: 16, 4th, anatomical, anatomy, animal, animals, aquatic, biological, biology, blastomere, blastomeres, blue, cell, cells, developing, development, developmental, dic, differential interference contrast, dividing, division, echinoderm, echinoidea, embryo, embryogenesis, embryological, embryology, fauna, fertilised, formation, forming, fourth division, growing, invertebrate, invertebrates, light micrograph, light microscope, marine biology, mitosis, mitotic, nature, organism, paracentrotus lividus, purple sea urchin, reproduction, sea urchin, sequence, sixteen, sixteen-cell, zona pellucida, zoological, zoology

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