Sea urchin embryo, two-cell stage

Sea urchin embryo, two-cell stage

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Credit: MICHEL DELARUE, ISM/SCIENCE PHOTO LIBRARY

Caption: Sea urchin embryo, two-cell stage, light micrograph. This is the stage that occurs after fertilisation. A few hours after a sperm cell has penetrated the egg (ovum) and their genetic material has combined, the fertilised ovum divides into two identical cells called blastomeres. The sea urchin has long been used as a model organism in reproductive biology. This is a phase contrast image.

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Keywords: anatomy, animal body, biological, biology, blastomere, blastomeres, cells, dividing, division, duo, embryo, embryology, embryonic, images, light micrograph, light microscope, magnified image, microscopic subjects, mitosis, mitotic, pair, phase contrast, reproduction, reproductive, sea urchin, two

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