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    Human fetus developing at week 12, computer illustration. — Stock Photo
    Human fetus developing at week 12, computer illustration.
    Human fetus developing at week 20, computer illustration. — Stock Photo
    Human fetus developing at week 20, computer illustration.
    View of fetus at 8 weeks — Stock Photo
    View of fetus at 8 weeks
    View of fetus at 12 weeks — Stock Photo
    View of fetus at 12 weeks
    Embryo at blastocyst stage — Stock Photo
    Embryo at blastocyst stage
    Embryo selection for IVF — Stock Photo
    Embryo selection for IVF
    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.
    Human fetus developing at week 40, computer illustration. — Stock Photo
    Human fetus developing at week 40, 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 30 weeks — Stock Photo
    View of fetus at 30 weeks
    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 32, computer illustration. — Stock Photo
    Human fetus developing at week 32, computer illustration.
    Human fetus developing at week 27, computer illustration. — Stock Photo
    Human fetus developing at week 27, computer illustration.
    Realistic human fetus at week 11, computer illustration. — Stock Photo
    Realistic human fetus at week 11, computer illustration.
    View of Fetus at 14 weeks — Stock Photo
    View of Fetus at 14 weeks
    View of fetus at 23 weeks — Stock Photo
    View of fetus at 23 weeks
    View of Fetus at 36 weeks — Stock Photo
    View of Fetus at 36 weeks
    Human fetus developing at week 21, computer illustration. — Stock Photo
    Human fetus developing at week 21, computer illustration.
    Human fetus developing at week 24, computer illustration. — Stock Photo
    Human fetus developing at week 24, computer illustration.
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    Realistic human fetus at week 33, computer illustration. — Stock Photo
    Realistic human fetus at week 33, computer illustration.
    Human fetus developing at week 27, computer illustration. — Stock Photo
    Human fetus developing at week 27, computer illustration.
    View of Fetus at 34 weeks — Stock Photo
    View of Fetus at 34 weeks
    View of Fetus at 5 weeks — Stock Photo
    View of Fetus at 5 weeks
    Pregnant woman and 6 week embryo — Stock Photo
    Pregnant woman and 6 week embryo
    Realistic human fetus at week 7, computer illustration. — Stock Photo
    Realistic human fetus at week 7, computer illustration.
    View of Full-term fetus — Stock Photo
    View of Full-term fetus
    View of Fetus at 32 weeks — Stock Photo
    View of Fetus at 32 weeks
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    Human fetus developing at week 34, computer illustration. — Stock Photo
    Human fetus developing at week 34, computer illustration.
    Human fetus developing at week 22, computer illustration. — Stock Photo
    Human fetus developing at week 22, computer illustration.
    View of fetus at 8 weeks — Stock Photo
    View of fetus at 8 weeks
    Realistic human fetus at week 10, computer illustration. — Stock Photo
    Realistic human fetus at week 10, computer illustration.
    View of fetus at 6 weeks — Stock Photo
    View of fetus at 6 weeks
    Human embryo cell, digital illustration. — Stock Photo
    Human embryo cell, digital illustration.
    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 15, computer illustration. — Stock Photo
    Human fetus developing at week 15, computer illustration.
    Two-cell embryo — Stock Photo
    Two-cell embryo
    View of Fetus at 38 weeks — Stock Photo
    View of Fetus at 38 weeks
    View of fetus at 7 weeks — Stock Photo
    View of fetus at 7 weeks
    Human Embryo at 5 weeks — Stock Photo
    Human Embryo at 5 weeks
    Two month old fetus — Stock Photo
    Two month old fetus
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Human fetus developing at week 38, computer illustration. — Stock Photo
    Human fetus developing at week 38, computer illustration.
    Embryonic stem cells, illustration. — Stock Photo
    Embryonic stem cells, illustration.
    View of Fetus at 11 weeks — Stock Photo
    View of Fetus at 11 weeks
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    View of Fetus at 25 weeks — Stock Photo
    View of Fetus at 25 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 6, computer illustration. — Stock Photo
    Realistic human fetus at week 6, computer illustration.
    Human fetus developing at week 6, computer illustration. — Stock Photo
    Human fetus developing at week 6, computer illustration.
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    View of Full-term fetus — Stock Photo
    View of Full-term fetus
    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
    Realistic human fetus at week 28, computer illustration. — Stock Photo
    Realistic human fetus at week 28, computer illustration.
    Human fetus developing at week 31, computer illustration. — Stock Photo
    Human fetus developing at week 31, computer illustration.
    View of fetus at 39 weeks — Stock Photo
    View of fetus at 39 weeks
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.