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    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail. — Stock Photo
    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail.
    Volunteers talking at construction site — Stock Photo
    Volunteers talking at construction site
    Human fetus developing at week 4, computer illustration. — Stock Photo
    Human fetus developing at week 4, computer illustration.
    Physical therapist performing skinfold test to measuring teenage boy body fat. — Stock Photo
    Physical therapist performing skinfold test to measuring teenage boy body fat.
    Illustration of human foetus on week 38 term. — Stock Photo
    Illustration of human foetus on week 38 term.
    Human fetus developing at week 20, computer illustration. — Stock Photo
    Human fetus developing at week 20, computer illustration.
    Carpenters lifting a laminated beam at a construction site — Stock Photo
    Carpenters lifting a laminated beam at a construction site
    Illustration of red human embryo on black background at pregnancy stage of week 38. — Stock Photo
    Illustration of red human embryo on black background at pregnancy stage of week 38.
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.
    Carpenters holding a plank at a construction site — Stock Photo
    Carpenters holding a plank at a construction site
    View of Fetus at 21 weeks — Stock Photo
    View of Fetus at 21 weeks
    Human fetus developing at week 29, computer illustration. — Stock Photo
    Human fetus developing at week 29, computer illustration.
    Human fetus at week 22, computer illustration. — Stock Photo
    Human fetus at week 22, computer illustration.
    Realistic human fetus at week 6, computer illustration. — Stock Photo
    Realistic human fetus at week 6, computer illustration.
    Human fetus at week 38, multicolored digital illustration. — Stock Photo
    Human fetus at week 38, multicolored digital illustration.
    Molecules of thyroid hormones triiodothyronine T3 and thyroxine T4 in human body, digital illustration. — Stock Photo
    Molecules of thyroid hormones triiodothyronine T3 and thyroxine T4 in human body, digital illustration.
    Illustration of human foetus on week 6 on blue background. — Stock Photo
    Illustration of human foetus on week 6 on blue background.
    View of Fetus at 7 weeks — Stock Photo
    View of Fetus at 7 weeks
    Aerial view of modern architecture and Yanan Road overpass, Shanghai — Stock Photo
    Aerial view of modern architecture and Yanan Road overpass, Shanghai
    Human fetus at week 34, multicolored digital illustration. — Stock Photo
    Human fetus at week 34, multicolored digital illustration.
    Illustration of red human embryo on black background at pregnancy stage of week 12. — Stock Photo
    Illustration of red human embryo on black background at pregnancy stage of week 12.
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes. — Stock Photo
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes.
    Human fetus at week 31, multicolored digital illustration. — Stock Photo
    Human fetus at week 31, multicolored digital illustration.
    City night scene in Beijing, aerial view — Stock Photo
    City night scene in Beijing, aerial view
    View of Embryo at 5 weeks — Stock Photo
    View of Embryo at 5 weeks
    Human fetus developing at week 37, computer illustration. — Stock Photo
    Human fetus developing at week 37, computer illustration.
    Human fetus at week 4, realistic digital illustration. — Stock Photo
    Human fetus at week 4, realistic digital illustration.
    Human fetus age 12 weeks — Stock Photo
    Human fetus age 12 weeks
    View of fetus at 20 weeks — Stock Photo
    View of fetus at 20 weeks
    Embryo selection for IVF — Stock Photo
    Embryo selection for IVF
    Human fetus at week 26, multicolored digital illustration. — Stock Photo
    Human fetus at week 26, multicolored digital illustration.
    Baby girl on a blanket practicing head support during tummy time — Stock Photo
    Baby girl on a blanket practicing head support during tummy time
    View of fetus at 7 weeks — Stock Photo
    View of fetus at 7 weeks
    Illustration of human foetus on week 5 on white background. — Stock Photo
    Illustration of human foetus on week 5 on white background.
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    16-cell morula embryo — Stock Photo
    16-cell morula embryo
    Human fetus at week 7, realistic digital illustration. — Stock Photo
    Human fetus at week 7, realistic digital illustration.
    Realistic human fetus at week 16, computer illustration. — Stock Photo
    Realistic human fetus at week 16, computer illustration.
    Illustration of human foetus on week 32 term. — Stock Photo
    Illustration of human foetus on week 32 term.
    Human fetus at week 16, computer illustration. — Stock Photo
    Human fetus at week 16, computer illustration.
    Illustration of red human embryo on black background at pregnancy stage of week 13. — Stock Photo
    Illustration of red human embryo on black background at pregnancy stage of week 13.
    Illustration of silhouette of pregnant woman and 35 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 35 week foetus.
    Illustration of silhouette of pregnant woman and 17 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 17 week foetus.
    Human fetus at week 27, realistic digital illustration. — Stock Photo
    Human fetus at week 27, realistic digital illustration.
    Human fetus age at 38 weeks — Stock Photo
    Human fetus age at 38 weeks
    Realistic human fetus at week 8, computer illustration. — Stock Photo
    Realistic human fetus at week 8, computer illustration.
    Human fetus at week 35, realistic digital illustration. — Stock Photo
    Human fetus at week 35, realistic digital illustration.
    Realistic human fetus at week 4, computer illustration. — Stock Photo
    Realistic human fetus at week 4, computer illustration.
    Illustration of human foetus on week 9 on blue background. — Stock Photo
    Illustration of human foetus on week 9 on blue background.
    Human fetus at week 8, computer illustration. — Stock Photo
    Human fetus at week 8, computer illustration.
    Human fetus at week 24, multicolored digital illustration. — Stock Photo
    Human fetus at week 24, multicolored digital illustration.
    View of Fetus at 16 weeks — Stock Photo
    View of Fetus at 16 weeks
    Human fetus at week 13, realistic digital illustration. — Stock Photo
    Human fetus at week 13, realistic digital illustration.
    Smiling volunteers reviewing blueprints at construction site — Stock Photo
    Smiling volunteers reviewing blueprints at construction site
    Illustration of silhouette of pregnant woman and 19 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 19 week foetus.
    Illustration of human multi-cellular embryo. — Stock Photo
    Illustration of human multi-cellular embryo.
    Illustration of human foetus on week 39 term. — Stock Photo
    Illustration of human foetus on week 39 term.
    Human fetus developing at week 40, computer illustration. — Stock Photo
    Human fetus developing at week 40, computer illustration.
    Human fetus at week 8, multicolored digital illustration. — Stock Photo
    Human fetus at week 8, multicolored digital illustration.
    Human four-cell embryo, digital illustration. — Stock Photo
    Human four-cell embryo, digital illustration.