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    Human fetus developing at week 32, computer illustration. — Stock Photo
    Human fetus developing at week 32, computer illustration.
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Embryonic stem cells — Stock Photo
    Embryonic stem cells
    Human fetus developing at week 29, computer illustration. — Stock Photo
    Human fetus developing at week 29, computer illustration.
    Eight-cell embryo — Stock Photo
    Eight-cell embryo
    Human fetus developing at week 4, computer illustration. — Stock Photo
    Human fetus developing at week 4, computer illustration.
    View of Fetus at 11 weeks — Stock Photo
    View of Fetus at 11 weeks
    Realistic human fetus at week 19, computer illustration. — Stock Photo
    Realistic human fetus at week 19, computer illustration.
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.
    View of Fetus at 16 weeks — Stock Photo
    View of Fetus at 16 weeks
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    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 27, computer illustration. — Stock Photo
    Human fetus developing at week 27, computer illustration.
    View of Fetus at 6 weeks — Stock Photo
    View of Fetus at 6 weeks
    Human fetus developing at week 23, computer illustration. — Stock Photo
    Human fetus developing at week 23, computer 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.