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    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.
    Dividing stem cells — Stock Photo
    Dividing stem cells
    Volunteers talking at construction site — Stock Photo
    Volunteers talking at construction site
    Human fetus at week 36, computer illustration. — Stock Photo
    Human fetus at week 36, computer illustration.
    Illustration of human foetus on week 5 of pregnancy. — Stock Photo
    Illustration of human foetus on week 5 of pregnancy.
    Realistic human fetus at week 39, computer illustration. — Stock Photo
    Realistic human fetus at week 39, computer illustration.
    Human fetus developing at week 10, computer illustration. — Stock Photo
    Human fetus developing at week 10, computer illustration.
    Illustration of human foetus on week 11 term. — Stock Photo
    Illustration of human foetus on week 11 term.
    Illustration of silhouette of pregnant woman and 37 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 37 week foetus.
    View of Fetus at 19 weeks — Stock Photo
    View of Fetus at 19 weeks
    Realistic human fetus at week 12, computer illustration. — Stock Photo
    Realistic human fetus at week 12, computer illustration.
    Human fetus developing at week 7, computer illustration. — Stock Photo
    Human fetus developing at week 7, computer illustration.
    Human fetus age 37 weeks — Stock Photo
    Human fetus age 37 weeks
    Human fetus at week 35, computer illustration. — Stock Photo
    Human fetus at week 35, computer illustration.
    Embryo selection for IVF — Stock Photo
    Embryo selection for IVF
    Carpenter removing nail from rafter end, cropped image — Stock Photo
    Carpenter removing nail from rafter end, cropped image
    Illustration of human foetus on week 30 term. — Stock Photo
    Illustration of human foetus on week 30 term.
    Realistic human fetus at week 33, computer illustration. — Stock Photo
    Realistic human fetus at week 33, computer illustration.
    Illustration of human foetus on week 26 term. — Stock Photo
    Illustration of human foetus on week 26 term.
    Human fetus at week 34, computer illustration. — Stock Photo
    Human fetus at week 34, computer illustration.
    Illustration of silhouette of pregnant woman and 39 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 39 week foetus.
    Physical therapist placing reflective marking balls for posture analysis of teenage boy. — Stock Photo
    Physical therapist placing reflective marking balls for posture analysis of teenage boy.
    Three week old embryo — Stock Photo
    Three week old embryo
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Hands of physical therapist performing skinfold test to measuring teenage boy body fat. — Stock Photo
    Hands of physical therapist performing skinfold test to measuring teenage boy body fat.
    Human fetus at 24 weeks, digital illustration. — Stock Photo
    Human fetus at 24 weeks, digital illustration.
    Human fetus developing at week 8, computer illustration. — Stock Photo
    Human fetus developing at week 8, computer illustration.
    Realistic human fetus at week 37, computer illustration. — Stock Photo
    Realistic human fetus at week 37, computer illustration.
    Human fetus at week 6, realistic digital illustration. — Stock Photo
    Human fetus at week 6, realistic digital illustration.
    Dalian city night scene in China — Stock Photo
    Dalian city night scene in China
    View of Fetus in the womb — Stock Photo
    View of Fetus in the womb
    Human fetus at week 11, multicolored digital illustration. — Stock Photo
    Human fetus at week 11, multicolored digital illustration.
    Human fetus at week 31, realistic digital illustration. — Stock Photo
    Human fetus at week 31, realistic digital illustration.
    Jianshe Road building, Heping District, Tianjin, China — Stock Photo
    Jianshe Road building, Heping District, Tianjin, China
    Embryo at blastocyst stage — Stock Photo
    Embryo at blastocyst stage
    Human fetus at week 18, multicolored digital illustration. — Stock Photo
    Human fetus at week 18, multicolored digital illustration.
    Human fetus developing at week 38, computer illustration. — Stock Photo
    Human fetus developing at week 38, computer illustration.
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    Volunteers with clipboard talking at construction site — Stock Photo
    Volunteers with clipboard talking at construction site
    Realistic human fetus at week 36, computer illustration. — Stock Photo
    Realistic human fetus at week 36, computer illustration.
    Volunteers working at construction site — Stock Photo
    Volunteers working at construction site
    Illustration of silhouette of pregnant woman with visible uterus and 2 cell stage embryo. — Stock Photo
    Illustration of silhouette of pregnant woman with visible uterus and 2 cell stage embryo.
    Illustration of silhouette of pregnant woman and 34 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 34 week foetus.
    View of Fetus at 28 weeks — Stock Photo
    View of Fetus at 28 weeks
    Human fetus age 29 weeks — Stock Photo
    Human fetus age 29 weeks
    Human fetus at week 14, realistic digital illustration. — Stock Photo
    Human fetus at week 14, realistic digital illustration.
    Realistic human fetus at week 19, computer illustration. — Stock Photo
    Realistic human fetus at week 19, computer illustration.
    Illustration of human foetus on week 34 term. — Stock Photo
    Illustration of human foetus on week 34 term.
    Little boy on a hike during a gloomy day in Southern California — Stock Photo
    Little boy on a hike during a gloomy day in Southern California
    Illustration of silhouette of pregnant woman and 6 week foetus. — Stock Photo
    Illustration of silhouette of pregnant woman and 6 week foetus.
    Night view of Tianjin City, China — Stock Photo
    Night view of Tianjin City, China
    Illustration of human foetus on week 7 of pregnancy. — Stock Photo
    Illustration of human foetus on week 7 of pregnancy.
    Illustration of red human embryo on black background at pregnancy stage of week 20. — Stock Photo
    Illustration of red human embryo on black background at pregnancy stage of week 20.
    Human fetus at week 4, digital illustration. — Stock Photo
    Human fetus at week 4, digital illustration.
    Realistic human fetus at week 39, computer illustration. — Stock Photo
    Realistic human fetus at week 39, computer illustration.
    Aerial view of modern architecture and Yanan Road overpass, Shanghai — Stock Photo
    Aerial view of modern architecture and Yanan Road overpass, Shanghai
    Two month old fetus — Stock Photo
    Two month old fetus
    Transplacental transmission of Toxoplasma gondii parasites to human embryo, conceptual illustration. — Stock Photo
    Transplacental transmission of Toxoplasma gondii parasites to human embryo, conceptual illustration.
    View of Fetus at 6 weeks — Stock Photo
    View of Fetus at 6 weeks
    Human fetus at week 33, realistic digital illustration. — Stock Photo
    Human fetus at week 33, realistic digital illustration.