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    Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (blue) are seen in the heads. Zebrafish eggs are transparent — Stock Photo
    Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (blue) are seen in the heads. Zebrafish eggs are transparent
    Human fetus developing at week 5, computer illustration. — Stock Photo
    Human fetus developing at week 5, computer illustration.
    Human fetus developing at week 24, computer illustration. — Stock Photo
    Human fetus developing at week 24, computer illustration.
    Human fetus developing at week 22, computer illustration. — Stock Photo
    Human fetus developing at week 22, computer illustration.
    Realistic human fetus at week 11, computer illustration. — Stock Photo
    Realistic human fetus at week 11, computer illustration.
    Blastocyst hollow ball of cells with fluid, digital illustration. — Stock Photo
    Blastocyst hollow ball of cells with fluid, digital illustration.
    View of Fetus at 21 weeks — Stock Photo
    View of Fetus at 21 weeks
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    View of fetus at 20 weeks — Stock Photo
    View of fetus at 20 weeks
    Human embryonic stem cell on pin tip, conceptual digital artwork. — Stock Photo
    Human embryonic stem cell on pin tip, conceptual digital artwork.
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.
    Human fetus developing at week 4, computer illustration. — Stock Photo
    Human fetus developing at week 4, computer illustration.
    Human fetus developing at week 6, computer illustration. — Stock Photo
    Human fetus developing at week 6, computer illustration.
    Blastocyst hollow ball of cells with fluid, digital illustration. — Stock Photo
    Blastocyst hollow ball of cells with fluid, digital illustration.
    Realistic human fetus at week 10, computer illustration. — Stock Photo
    Realistic human fetus at week 10, computer illustration.
    Human fetus developing at week 40, computer illustration. — Stock Photo
    Human fetus developing at week 40, computer illustration.
    Human fetus developing at week 15, computer illustration. — Stock Photo
    Human fetus developing at week 15, computer illustration.
    Human fetus developing at week 36, computer illustration. — Stock Photo
    Human fetus developing at week 36, computer illustration.
    Realistic human fetus at week 4, computer illustration. — Stock Photo
    Realistic human fetus at week 4, computer illustration.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    Human fetus developing at week 21, computer illustration. — Stock Photo
    Human fetus developing at week 21, computer illustration.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    Two month old fetus — Stock Photo
    Two month old fetus
    Realistic human fetus at week 19, computer illustration. — Stock Photo
    Realistic human fetus at week 19, computer illustration.
    Realistic human fetus at week 21, computer illustration. — Stock Photo
    Realistic human fetus at week 21, computer illustration.
    View of Fetus at 12 weeks — Stock Photo
    View of Fetus at 12 weeks
    View of Fetus at 6 weeks — Stock Photo
    View of Fetus at 6 weeks
    Realistic human fetus at week 30, computer illustration. — Stock Photo
    Realistic human fetus at week 30, computer illustration.
    View of Fetus at 21 weeks — Stock Photo
    View of Fetus at 21 weeks
    16-cell morula embryo — Stock Photo
    16-cell morula embryo
    Human fetus developing at week 14, computer illustration. — Stock Photo
    Human fetus developing at week 14, computer illustration.
    Human fetus developing at week 36, computer illustration. — Stock Photo
    Human fetus developing at week 36, computer illustration.
    Human fetus developing at week 12, computer illustration. — Stock Photo
    Human fetus developing at week 12, computer illustration.
    Human four-cell embryo, digital illustration. — Stock Photo
    Human four-cell embryo, digital illustration.
    View of Fetus at 9 weeks — Stock Photo
    View of Fetus at 9 weeks
    Human fetus developing at week 34, computer illustration. — Stock Photo
    Human fetus developing at week 34, computer illustration.
    View of Fetus at 13 weeks — Stock Photo
    View of Fetus at 13 weeks
    Human two-cell embryo, digital illustration. — Stock Photo
    Human two-cell embryo, digital illustration.
    Embryonic stem cells, illustration. — Stock Photo
    Embryonic stem cells, illustration.
    View of Fetus at 10 weeks — Stock Photo
    View of Fetus at 10 weeks
    View of Fetus at 32 weeks — Stock Photo
    View of Fetus at 32 weeks
    View of fetus at 6 weeks — Stock Photo
    View of fetus at 6 weeks
    Human fetus developing at week 38, computer illustration. — Stock Photo
    Human fetus developing at week 38, computer illustration.
    Realistic human fetus at week 31, computer illustration. — Stock Photo
    Realistic human fetus at week 31, computer illustration.
    View of Fetus at 5 weeks — Stock Photo
    View of Fetus at 5 weeks
    Human fetus developing at week 9, computer illustration. — Stock Photo
    Human fetus developing at week 9, computer illustration.
    View of Fetus at 31 weeks — Stock Photo
    View of Fetus at 31 weeks
    View of Fetus at 30 weeks — Stock Photo
    View of Fetus at 30 weeks
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    View of fetus at 7 weeks — Stock Photo
    View of fetus at 7 weeks
    Realistic human fetus at week 5, computer illustration. — Stock Photo
    Realistic human fetus at week 5, computer illustration.
    View of Fetus at 34 weeks — Stock Photo
    View of Fetus at 34 weeks
    Human embryonic stem cells, digital illustration. — Stock Photo
    Human embryonic stem cells, digital illustration.
    Realistic human fetus at week 32, computer illustration. — Stock Photo
    Realistic human fetus at week 32, computer illustration.
    Realistic human fetus at week 28, computer illustration. — Stock Photo
    Realistic human fetus at week 28, computer illustration.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.
    View of Fetus at 25 weeks — Stock Photo
    View of Fetus at 25 weeks
    View of Fetus at 23 weeks — Stock Photo
    View of Fetus at 23 weeks