Sea urchin fertilisation

Sea urchin fertilisation

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Credit: GERARD PEAUCELLIER, ISM /SCIENCE PHOTO LIBRARY

Caption: Sea urchin fertilisation. Differential interference contrast light micrograph of a sea urchin (Paracentrotus lividus) egg cell (ovum) showing lifting (upper left) of the zona pellucida (outer membrane) soon after fertilisation by a sperm cell (spermatozoon, not seen). Magnification: x220 when printed at 10 centimetres wide.

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Keywords: anatomical, anatomy, animal, animals, aquatic, biological, biology, blue, cell, cells, developing, development, developmental, dic, differential interference contrast, echinoderm, echinoidea, egg cell, fauna, fertilisation, fertilised, invertebrate, invertebrates, lifting, light micrograph, light microscope, marine biology, membrane, nature, organism, ovum, paracentrotus lividus, purple sea urchin, reproduction, sea urchin, sequence, surface, zona pellucida, zoological, zoology

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