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    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Red blood cells — Stock Photo
    Red blood cells
    Ascaris Roundworm ovaries — Stock Photo
    Ascaris Roundworm ovaries
    T lymphocyte (orange) attached to a cancer cell (blue), illustration. T lymphocytes are a type of white blood cell which matures in the thymus — Stock Photo
    T lymphocyte (orange) attached to a cancer cell (blue), illustration. T lymphocytes are a type of white blood cell which matures in the thymus
    Magnified digital illustration of eosinophil cell. — Stock Photo
    Magnified digital illustration of eosinophil cell.
    Bacteria and viruses in human artery, digital illustration. — Stock Photo
    Bacteria and viruses in human artery, digital illustration.
    Nerve cell with many dendrites on blue background, digital illustration. — Stock Photo
    Nerve cell with many dendrites on blue background, digital illustration.
    Oesophageal cancer, composite digital illustration with human body and cancer cell. — Stock Photo
    Oesophageal cancer, composite digital illustration with human body and cancer cell.
    Nerve cell structure in cross section on white background, digital illustration. — Stock Photo
    Nerve cell structure in cross section on white background, digital illustration.
    Dopaminergic neuron brain cells, digital illustration. — Stock Photo
    Dopaminergic neuron brain cells, digital illustration.
    Fatcells structure and anatomy — Stock Photo
    Fatcells structure and anatomy
    Blue colored nerve cell on dark background, digital illustration. — Stock Photo
    Blue colored nerve cell on dark background, digital illustration.
    Erythrocytes red blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes red blood cells in human blood vessel, digital illustration.
    Digital illustration of immunoglobulin in blood. — Stock Photo
    Digital illustration of immunoglobulin in blood.
    Cancer cell clinging to human colon tissue, conceptual illustration. — Stock Photo
    Cancer cell clinging to human colon tissue, conceptual illustration.
    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.
    3d rendered abstract illustration of blue nerve cell. — Stock Photo
    3d rendered abstract illustration of blue nerve cell.
    Magnified digital illustration of megakaryocyte cell. — Stock Photo
    Magnified digital illustration of megakaryocyte cell.
    Relation of thyroid and pituitary gland — Stock Photo
    Relation of thyroid and pituitary gland
    Illustration of a 8 cell stage egg on black background. — Stock Photo
    Illustration of a 8 cell stage egg on black background.
    Sperm cell, or spermatozoa — Stock Photo
    Sperm cell, or spermatozoa
    3d illustration of transparent cells with nuclei on purple background. — Stock Photo
    3d illustration of transparent cells with nuclei on purple background.
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa. — Stock Photo
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa.
    Human sperm cells — Stock Photo
    Human sperm cells
    Sperm fertilising an egg — Stock Photo
    Sperm fertilising an egg
    Anonymous person holding wax honeycomb with hexagonal cells for apiary and beekeeping concept background — Stock Photo
    Anonymous person holding wax honeycomb with hexagonal cells for apiary and beekeeping concept background
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia. — Stock Photo
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia.
    Animal cell with mitochondria, digital illustration. — Stock Photo
    Animal cell with mitochondria, digital illustration.
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles. — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles.
    T-cell receptor-MHC-antigen complex — Stock Photo
    T-cell receptor-MHC-antigen complex
    Human nerve structure in cross section, digital illustration. — Stock Photo
    Human nerve structure in cross section, digital illustration.
    Sperm cell with multiple tails — Stock Photo
    Sperm cell with multiple tails
    Bacteriastrum sp. diatom algae — Stock Photo
    Bacteriastrum sp. diatom algae
    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.
    Egg and sperm fertilization process — Stock Photo
    Egg and sperm fertilization process
    Brain cancer, conceptual computer illustration — Stock Photo
    Brain cancer, conceptual computer illustration
    Opioid and cannabinoid receptors in brain cell membrane, illustration. — Stock Photo
    Opioid and cannabinoid receptors in brain cell membrane, illustration.
    Anthrax bacteria structure — Stock Photo
    Anthrax bacteria structure
    Dividing bacteria on tissue surface — Stock Photo
    Dividing bacteria on tissue surface
    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.
    Adipocyte fat cells, digital illustration. — Stock Photo
    Adipocyte fat cells, digital illustration.
    Single abstract bacterium on black background, computer illustration. — Stock Photo
    Single abstract bacterium on black background, computer illustration.
    3d illustration of internal structure of human cell. — Stock Photo
    3d illustration of internal structure of human cell.
    Colorectal cancer cell — Stock Photo
    Colorectal cancer cell
    Colored scanning electron micrograph of pollen grains from Nymphaeaceae water lily flower. — Stock Photo
    Colored scanning electron micrograph of pollen grains from Nymphaeaceae water lily flower.
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration. — Stock Photo
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration.
    Red blood cells and virus particles, computer illustration. — Stock Photo
    Red blood cells and virus particles, computer illustration.
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Abstract animal cell on black background, digital illustration. — Stock Photo
    Abstract animal cell on black background, digital illustration.
    Plasmodium vivax protozoa inside blood vessel, digital illustration. — Stock Photo
    Plasmodium vivax protozoa inside blood vessel, digital illustration.
    Illustration of antigen-presenting cell activity of dendritic cells through membrane-bound histocompatibility complex molecules. — Stock Photo
    Illustration of antigen-presenting cell activity of dendritic cells through membrane-bound histocompatibility complex molecules.
    3d illustration of cell division, cell membrane and splitting red nucleus. — Stock Photo
    3d illustration of cell division, cell membrane and splitting red nucleus.
    Normal human arteries, — Stock Photo
    Normal human arteries,
    Computer illustration of white adipose (fat) cells, lying in a matrix of collagen. Adipose tissue stores energy and helps insulate our bodies as well as cushioning the organs. — Stock Photo
    Computer illustration of white adipose (fat) cells, lying in a matrix of collagen. Adipose tissue stores energy and helps insulate our bodies as well as cushioning the organs.
    Human immunodeficiency virus structure — Stock Photo
    Human immunodeficiency virus structure
    Digital illustration of colorful Polio virus particle. — Stock Photo
    Digital illustration of colorful Polio virus particle.