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    Two month old fetus — Stock Photo
    Two month old fetus
    Human fetus developing at week 4, computer illustration. — Stock Photo
    Human fetus developing at week 4, computer illustration.
    Human fetus developing at week 11, computer illustration. — Stock Photo
    Human fetus developing at week 11, computer illustration.
    Full-term fetus — Stock Photo
    Full-term fetus
    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.
    Realistic human fetus at week 31, computer illustration. — Stock Photo
    Realistic human fetus at week 31, computer illustration.
    Human Embryo at 5 weeks — Stock Photo
    Human Embryo at 5 weeks
    View of Fetus at 9 weeks — Stock Photo
    View of Fetus at 9 weeks
    View of Fetus in the womb — Stock Photo
    View of Fetus in the womb
    View of fetus at 12 weeks — Stock Photo
    View of fetus at 12 weeks
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    Human fetus developing at week 28, computer illustration. — Stock Photo
    Human fetus developing at week 28, computer illustration.
    View of Full-term fetus — Stock Photo
    View of Full-term fetus
    View of Fetus at 33 weeks — Stock Photo
    View of Fetus at 33 weeks
    Realistic human fetus at week 25, computer illustration. — Stock Photo
    Realistic human fetus at week 25, computer illustration.
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    View of Fetus at 12 weeks — Stock Photo
    View of Fetus at 12 weeks
    Human fetus developing at week 33, computer illustration. — Stock Photo
    Human fetus developing at week 33, computer illustration.
    Realistic human fetus at week 39, computer illustration. — Stock Photo
    Realistic human fetus at week 39, computer illustration.
    Human fetus developing at week 15, computer illustration. — Stock Photo
    Human fetus developing at week 15, computer illustration.
    Two month old fetus — Stock Photo
    Two month old fetus
    View of Fetus at 15 weeks — Stock Photo
    View of Fetus at 15 weeks
    View of fetus at 7 weeks — Stock Photo
    View of fetus at 7 weeks
    Human fetus developing at week 32, computer illustration. — Stock Photo
    Human fetus developing at week 32, computer illustration.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    View of Full-term fetus — Stock Photo
    View of Full-term fetus
    Human fetus developing at week 29, computer illustration. — Stock Photo
    Human fetus developing at week 29, computer illustration.
    View of Fetus at 33 weeks — Stock Photo
    View of Fetus at 33 weeks
    Human fetus developing at week 4, computer illustration. — Stock Photo
    Human fetus developing at week 4, computer illustration.
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Realistic human fetus at week 19, computer illustration. — Stock Photo
    Realistic human fetus at week 19, computer illustration.
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph. — Stock Photo
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph.
    Embryonic stem cells — Stock Photo
    Embryonic stem cells
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.
    Eight-cell embryo — Stock Photo
    Eight-cell embryo
    Human embryonic stem cell, digital illustration. — Stock Photo
    Human embryonic stem cell, digital illustration.
    View of Fetus at 11 weeks — Stock Photo
    View of Fetus at 11 weeks
    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
    View of Fetus at 16 weeks — Stock Photo
    View of Fetus at 16 weeks
    Human fetus developing at week 27, computer illustration. — Stock Photo
    Human fetus developing at week 27, computer illustration.
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Human fetus developing at week 23, computer illustration. — Stock Photo
    Human fetus developing at week 23, computer illustration.
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    View of Fetus at 6 weeks — Stock Photo
    View of Fetus at 6 weeks
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    View of Fetus at 13 weeks — Stock Photo
    View of Fetus at 13 weeks
    View of Fetus at 39 weeks — Stock Photo
    View of Fetus at 39 weeks
    View of Fetus at 13 weeks — Stock Photo
    View of Fetus at 13 weeks
    Human fetus developing at week 37, computer illustration. — Stock Photo
    Human fetus developing at week 37, computer illustration.
    Realistic human fetus at week 5, computer illustration. — Stock Photo
    Realistic human fetus at week 5, computer illustration.