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 gastrula stage of development. Following fertilisation an embryo undergoes multiple rounds of mitotic cell division, each time doubling the number of cells. Eventually a blastula of hundreds of cells is produced, which then start to differentiate. During gastrulation the single-layered blastula is reorganised into a three-layered (trilaminar) structure known as the gastrula. These three germ layers are known as the ectoderm, mesoderm, and endoderm. Magnification: x305 when printed at 10 centimetres wide.

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Keywords: anatomical, anatomy, animal, animals, aquatic, biological, biology, blastomere, blastomeres, blue, cell, cells, developing, development, developmental, dic, differential interference contrast, differentiating, differentiation, dividing, division, echinoderm, echinoidea, ectoderm, embryo, embryogenesis, embryological, embryology, endoderm, fauna, fertilised, formation, forming, gastrula, gastrulation, germ layer, growing, invertebrate, invertebrates, layers, light micrograph, light microscope, marine biology, mesoderm, nature, organism, paracentrotus lividus, purple sea urchin, reproduction, sea urchin, secondary mesenchyme, sequence, trilaminar, zoological, zoology

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