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    Coloured scanning electron micrograph (SEM) of squamous epithelial cells on the skin surface. — Stock Photo
    Coloured scanning electron micrograph (SEM) of squamous epithelial cells on the skin surface.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Different types of acne medical illustration — Stock Photo
    Different types of acne medical illustration
    Human red blood cells trapped in a fibrin blood clot, coloured scanning electron micrograph (SEM). — Stock Photo
    Human red blood cells trapped in a fibrin blood clot, coloured scanning electron micrograph (SEM).
    Scanning electron micrograph (SEM) of a PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph (SEM) of a PC12 neurone in culture.
    Coloured scanning electron micrograph (SEM) of squamous epithelial cells on the skin surface. — Stock Photo
    Coloured scanning electron micrograph (SEM) of squamous epithelial cells on the skin surface.
    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe). — Stock Photo
    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe).
    Stomach lining structure, computer illustration. — Stock Photo
    Stomach lining structure, computer illustration.
    Confocal light micrograph of mammalian fibroblast cells. — Stock Photo
    Confocal light micrograph of mammalian fibroblast cells.
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Freeze-fractured lens of an eye — Stock Photo
    Freeze-fractured lens of an eye
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Stem cell research — Stock Photo
    Stem cell research
    Stem cell research — Stock Photo
    Stem cell research
    Coloured scanning electron micrograph (SEM) of sensory inner hair cells from the organ of corti, in the cochlea of the inner ear. — Stock Photo
    Coloured scanning electron micrograph (SEM) of sensory inner hair cells from the organ of corti, in the cochlea of the inner ear.
    Smooth muscle structure, conceptual computer illustration. — Stock Photo
    Smooth muscle structure, conceptual computer illustration.
    Stem cell research — Stock Photo
    Stem cell research
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Fractured pancreas tissue — Stock Photo
    Fractured pancreas tissue
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red).
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell. — Stock Photo
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell.
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM). — Stock Photo
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of stubble on a man's face. — Stock Photo
    Coloured scanning electron micrograph (SEM) of stubble on a man's face.
    Scanning electron micrograph (SEM) of a PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph (SEM) of a PC12 neurone in culture.
    Coloured scanning electron micrograph (SEM) of human myeloid white blood cells found in bone marrow. — Stock Photo
    Coloured scanning electron micrograph (SEM) of human myeloid white blood cells found in bone marrow.
    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.
    Microscopic cross section view of HIV virus — Stock Photo
    Microscopic cross section view of HIV virus
    Stem cell research — Stock Photo
    Stem cell research
    58-cell blastocyst embryo — Stock Photo
    58-cell blastocyst embryo
    Visual rendering of Cells — Stock Photo
    Visual rendering of Cells
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Visual rendering of Cells — Stock Photo
    Visual rendering of Cells
    Cell layers of the retina — Stock Photo
    Cell layers of the retina
    Duct is lined with pseudostratified epithelium — Stock Photo
    Duct is lined with pseudostratified epithelium
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Fractured pancreas tissue — Stock Photo
    Fractured pancreas tissue
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Pathological anatomy of atherosclerosis — Stock Photo
    Pathological anatomy of atherosclerosis
    Pregnant woman and 6 week embryo — Stock Photo
    Pregnant woman and 6 week embryo
    Daisy pollen grain — Stock Photo
    Daisy pollen grain
    Cut in an artery seen from its interior — Stock Photo
    Cut in an artery seen from its interior
    Daisy pollen grain — Stock Photo
    Daisy pollen grain
    Atherosclerosis harming blood vessel — Stock Photo
    Atherosclerosis harming blood vessel
    Secondary follicles in an ovary — Stock Photo
    Secondary follicles in an ovary
    Undifferentiated stem cells — Stock Photo
    Undifferentiated stem cells
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Two-cell embryo — Stock Photo
    Two-cell embryo
    Secondary follicles in an ovary — Stock Photo
    Secondary follicles in an ovary
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Red blood cells — Stock Photo
    Red blood cells
    Visual rendering of Human cells — Stock Photo
    Visual rendering of Human cells
    Red and white blood cells — Stock Photo
    Red and white blood cells
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery