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    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).
    Nerve cell, computer illustration — Stock Photo
    Nerve cell, computer illustration
    Neutrophil in human blood, computer illustration. — Stock Photo
    Neutrophil in human blood, computer illustration.
    Virus particles spreading through blood stream — Stock Photo
    Virus particles spreading through blood stream
    Dividing stem cells — Stock Photo
    Dividing stem cells
    Platelets in human blood, computer illustration. — Stock Photo
    Platelets in human blood, computer illustration.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Thyroid gland cancer with closeup view of cancer cells, computer illustration. — Stock Photo
    Thyroid gland cancer with closeup view of cancer cells, computer illustration.
    Digital illustration of eosinophil white blood cells with lobed nuclei colored in purple. — Stock Photo
    Digital illustration of eosinophil white blood cells with lobed nuclei colored in purple.
    Blood clotting in an ovarian follicle — Stock Photo
    Blood clotting in an ovarian follicle
    Digital artwork of purple cancer cell on tissue surface. — Stock Photo
    Digital artwork of purple cancer cell on tissue surface.
    Nerve cells affected by alzheimers — Stock Photo
    Nerve cells affected by alzheimers
    Thyroid gland cancer with closeup view of cancer cells, computer illustration. — Stock Photo
    Thyroid gland cancer with closeup view of cancer cells, computer illustration.
    Monocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Monocyte white blood cell in blood smear, digital illustration.
    Nerve cell, computer illustration — Stock Photo
    Nerve cell, computer illustration
    Immune response to cancer — Stock Photo
    Immune response to cancer
    Brain neural network, computer illustration. — Stock Photo
    Brain neural network, computer illustration.
    Digital illustration of human nerve cell with dendrites. — Stock Photo
    Digital illustration of human nerve cell with dendrites.
    Lymphocyte, monocyte and neutrophil white blood cells in blood smear, digital illustration. — Stock Photo
    Lymphocyte, monocyte and neutrophil white blood cells in blood smear, digital illustration.
    Illustration of silhouette of pregnant woman with visible uterus and blastocyst. — Stock Photo
    Illustration of silhouette of pregnant woman with visible uterus and blastocyst.
    Human sperm cells, abstract computer illustration. — Stock Photo
    Human sperm cells, abstract computer illustration.
    Human artery showing artery walls and bloodstream — Stock Photo
    Human artery showing artery walls and bloodstream
    Erythrocyte red blood cell, digital illustration. — Stock Photo
    Erythrocyte red blood cell, digital illustration.
    Sperm cell with multiple tails — Stock Photo
    Sperm cell with multiple tails
    Blood stream and artery walls — Stock Photo
    Blood stream and artery walls
    Adipose tissue composed of adipocytes — Stock Photo
    Adipose tissue composed of adipocytes
    Human multi-cellular embryo — Stock Photo
    Human multi-cellular embryo
    Red blood cells — Stock Photo
    Red blood cells
    Human sperm cells — Stock Photo
    Human sperm cells
    Male sex cell — Stock Photo
    Male sex cell
    Brain and nerve cell — Stock Photo
    Brain and nerve cell
    Eight-cell embryo — Stock Photo
    Eight-cell embryo
    Cardiac muscle showing a metastatic seminoma — Stock Photo
    Cardiac muscle showing a metastatic seminoma
    Bacteria amidst blood cells in blood vessel, digital illustration. — Stock Photo
    Bacteria amidst blood cells in blood vessel, digital illustration.
    Red blood cells and blood vessel — Stock Photo
    Red blood cells and blood vessel
    Ovarian cells section — Stock Photo
    Ovarian cells section
    Human hair with dandruff, coloured scanning electron micrograph (SEM). — Stock Photo
    Human hair with dandruff, coloured scanning electron micrograph (SEM).
    3d illustration of blue cells pattern with yellow nuclei. — Stock Photo
    3d illustration of blue cells pattern with yellow nuclei.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    3d illustration of several falling hairs that have detached from skin. — Stock Photo
    3d illustration of several falling hairs that have detached from skin.
    Two-cell embryo — Stock Photo
    Two-cell embryo
    Magnified digital illustration of human cell cross-section. — Stock Photo
    Magnified digital illustration of human cell cross-section.
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Possible global pandemic. Vaccine study for the Coronavirus virus. — Stock Photo
    Possible global pandemic. Vaccine study for the Coronavirus virus.
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Illustration of sperm around human egg cell. — Stock Photo
    Illustration of sperm around human egg cell.
    Hepatic bile duct infected with cocidian protozoa — Stock Photo
    Hepatic bile duct infected with cocidian protozoa
    Blood stream and artery walls — Stock Photo
    Blood stream and artery walls
    Artery partially blocked by atheroma — Stock Photo
    Artery partially blocked by atheroma
    Sperm cells in seminiferous tubules — Stock Photo
    Sperm cells in seminiferous tubules
    Woman waving British flag being photographed on double-decker bus — Stock Photo
    Woman waving British flag being photographed on double-decker bus
    Colored digital illustration of green cancer cells. — Stock Photo
    Colored digital illustration of green cancer cells.
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Pathogenic bacteria in the blood stream — Stock Photo
    Pathogenic bacteria in the blood stream
    Coloured scanning electron micrograph of cultured cancer cell from human cervix showing numerous microvilli. — Stock Photo
    Coloured scanning electron micrograph of cultured cancer cell from human cervix showing numerous microvilli.
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph. — Stock Photo
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph.
    Possible global pandemic. Vaccine study for the Coronavirus virus. — Stock Photo
    Possible global pandemic. Vaccine study for the Coronavirus virus.
    Illustration of HIV particles in blood. — Stock Photo
    Illustration of HIV particles in blood.