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    Cell layers of the retina — Stock Photo
    Cell layers of the retina
    White blood cells and proteins, digital illustration. — Stock Photo
    White blood cells and proteins, digital illustration.
    Lymphocytes attacking viruses — Stock Photo
    Lymphocytes attacking viruses
    Human smooth muscle, light micrograph — Stock Photo
    Human smooth muscle, light micrograph
    Digital artwork of illuminated red human cancer cell. — Stock Photo
    Digital artwork of illuminated red human cancer cell.
    Illustration of abnormal red blood cells known as spur cells acanthocytes. — Stock Photo
    Illustration of abnormal red blood cells known as spur cells acanthocytes.
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration.
    Digital illustration of diseased fatty human heart and cross-section close-up of atherosclerotic plaque histological structure, necrotic centre, foam cells and T-lymphocytes. — Stock Photo
    Digital illustration of diseased fatty human heart and cross-section close-up of atherosclerotic plaque histological structure, necrotic centre, foam cells and T-lymphocytes.
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Illustration of abstract blue technological plexus nerve cell. — Stock Photo
    Illustration of abstract blue technological plexus nerve cell.
    Lymphocytes white blood cells, digital illustration. — Stock Photo
    Lymphocytes white blood cells, digital illustration.
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow) — Stock Photo
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow)
    Antibodies attacking cancer cell, computer illustration — Stock Photo
    Antibodies attacking cancer cell, computer illustration
    Sporangium fungal cell with spores — Stock Photo
    Sporangium fungal cell with spores
    Coloured scanning electron micrograph of cancer cell from human colon. — Stock Photo
    Coloured scanning electron micrograph of cancer cell from human colon.
    Destruction of a cancer cell by antibodies — Stock Photo
    Destruction of a cancer cell by antibodies
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration. — Stock Photo
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration.
    Donor blood in blood bags, close-up. — Stock Photo
    Donor blood in blood bags, close-up.
    Animal cell during cytokinesis cell division, digital illustration. — Stock Photo
    Animal cell during cytokinesis cell division, digital illustration.
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    Cells trapped in fibrin protein mesh — Stock Photo
    Cells trapped in fibrin protein mesh
    Plasmodium vivax protozoa inside blood vessel, digital illustration. — Stock Photo
    Plasmodium vivax protozoa inside blood vessel, digital illustration.
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Single abstract bacterium on black background, computer illustration. — Stock Photo
    Single abstract bacterium on black background, computer illustration.
    Measles virus particle, computer illustration. — Stock Photo
    Measles virus particle, computer illustration.
    Illustration of illuminated cancer cell on black background. — Stock Photo
    Illustration of illuminated cancer cell on black background.
    Bottlebrush pollen grain — Stock Photo
    Bottlebrush pollen grain
    Human nerve structure in cross section, digital illustration. — Stock Photo
    Human nerve structure in cross section, digital illustration.
    Trichomonas vaginalis causing trichomoniasis and neutrophils, digital illustration. — Stock Photo
    Trichomonas vaginalis causing trichomoniasis and neutrophils, digital illustration.
    Single abstract bacterium on black background, computer illustration. — Stock Photo
    Single abstract bacterium on black background, computer illustration.
    Nerve cell, computer illustration — Stock Photo
    Nerve cell, computer illustration
    Structure and shape of basophil — Stock Photo
    Structure and shape of basophil
    Pyoderma skin disease — Stock Photo
    Pyoderma skin disease
    Sporangium fungal cell with spores — Stock Photo
    Sporangium fungal cell with spores
    Purkinje cells and their dendritic processes — Stock Photo
    Purkinje cells and their dendritic processes
    Adenocarcinoma of the sigmoid colon — Stock Photo
    Adenocarcinoma of the sigmoid colon
    Paranasal sinus epithelium — Stock Photo
    Paranasal sinus epithelium
    HIV human immunodeficiency virus in bloodstream, digital illustration — Stock Photo
    HIV human immunodeficiency virus in bloodstream, digital illustration
    Cancer cells on plain background, digital illustration. — Stock Photo
    Cancer cells on plain background, digital illustration.
    Activated platelets in blood vessel — Stock Photo
    Activated platelets in blood vessel
    Lysosome fusing with autophagosome — Stock Photo
    Lysosome fusing with autophagosome
    Platelets in human blood, computer illustration. — Stock Photo
    Platelets in human blood, computer illustration.
    Section through bone marrow — Stock Photo
    Section through bone marrow
    Animal cell during cytokinesis (cell division), illustration. — Stock Photo
    Animal cell during cytokinesis (cell division), illustration.
    3d illustration of white blood cells leukocytes in human body. — Stock Photo
    3d illustration of white blood cells leukocytes in human body.
    Illustration of illuminated purple cancer cell on black background. — Stock Photo
    Illustration of illuminated purple cancer cell on black background.
    Digital illustration of trophozoite form of Acanthamoeba castellanii amoeba. — Stock Photo
    Digital illustration of trophozoite form of Acanthamoeba castellanii amoeba.
    Illustration of low density cholesterol lipoprotein in bloodstream. — Stock Photo
    Illustration of low density cholesterol lipoprotein in bloodstream.
    3d digital illustration of narrowed blood vessel. — Stock Photo
    3d digital illustration of narrowed blood vessel.
    Nerve cell with pink colored axon on blue background, digital illustration. — Stock Photo
    Nerve cell with pink colored axon on blue background, digital illustration.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Digital artwork of white blood cells attacking illuminated cancer cell. — Stock Photo
    Digital artwork of white blood cells attacking illuminated cancer cell.
    Human two-cell embryo, digital illustration. — Stock Photo
    Human two-cell embryo, digital illustration.
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Antibodies attacking cancer cell, computer illustration — Stock Photo
    Antibodies attacking cancer cell, computer illustration
    Normal sperm cells — Stock Photo
    Normal sperm cells
    Cells of brewer yeast — Stock Photo
    Cells of brewer yeast