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Sea urchin embryo development

Sea urchin embryo development

C013/1947

Rights Managed

25.0 MB (25.0 MB compressed)

3635 x 2400 pixels

30.7 x 20.3 cm ⏐ 12.1 x 8.0 in (300dpi)

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Credit

GERARD PEAUCELLIER, ISM / SCIENCE PHOTO LIBRARY 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 four-cell stage of development. These cells, or blastomeres, result from the second division of the fertilised egg, which normally occurs around 150 hours 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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