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    Coloured scanning electron micrograph of breast cancer cell. — Stock Photo
    Coloured scanning electron micrograph of breast cancer cell.
    Abstract green colored cancer cell on white background, digital illustration. — Stock Photo
    Abstract green colored cancer cell on white background, digital illustration.
    Sperm spermatozoa swimming towards egg cell, colored digital illustration. — Stock Photo
    Sperm spermatozoa swimming towards egg cell, colored digital illustration.
    Conceptual digital illustration showing Pentatrichomonas hominis parasites in drop of water from dirty tap. — Stock Photo
    Conceptual digital illustration showing Pentatrichomonas hominis parasites in drop of water from dirty tap.
    Neisseria meningitidis bacteria — Stock Photo
    Neisseria meningitidis bacteria
    Illustration of single human blood cell on white background. — Stock Photo
    Illustration of single human blood cell on white background.
    Plague bacteria (Yersinia pestis), computer illustration. — Stock Photo
    Plague bacteria (Yersinia pestis), computer illustration.
    Digital illustration showing close-up of cholera infection bacteria in small intestine. — Stock Photo
    Digital illustration showing close-up of cholera infection bacteria in small intestine.
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells. — Stock Photo
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.
    Digital illustration showing close-up of cholera infection bacteria in small intestine. — Stock Photo
    Digital illustration showing close-up of cholera infection bacteria in small intestine.
    Digital illustration of fungal morphology of filamentous allergenic fungus Alternaria alternata and photograph of fungal colonies on Sabouraud Dextrose Agar. — Stock Photo
    Digital illustration of fungal morphology of filamentous allergenic fungus Alternaria alternata and photograph of fungal colonies on Sabouraud Dextrose Agar.
    3d illustration of virus and bacteria above shiny surface. — Stock Photo
    3d illustration of virus and bacteria above shiny surface.
    Gram-positive Peptococcus bacteria, digital illustration. — Stock Photo
    Gram-positive Peptococcus bacteria, digital illustration.
    Alternaria fungi on black background, digital illustration. — Stock Photo
    Alternaria fungi on black background, digital illustration.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Digital illustration of cerebrospinal fluid and neutrophils with Neisseria meningitidis bacteria. — Stock Photo
    Digital illustration of cerebrospinal fluid and neutrophils with Neisseria meningitidis bacteria.
    Digital illustration of bacteria on tip of needle. — Stock Photo
    Digital illustration of bacteria on tip of needle.
    Magnified digital illustration of macrophage cell. — Stock Photo
    Magnified digital illustration of macrophage cell.
    Digital illustration of Enterobacter Gram-negative bacilli. — Stock Photo
    Digital illustration of Enterobacter Gram-negative bacilli.
    3d illustration of variety of different pollen grains. — Stock Photo
    3d illustration of variety of different pollen grains.
    Kidney glomeruli. Coloured scanning electron micrograph (SEM) of a resin cast of glomeruli capillaries and the larger blood vessels supplying them with blood — Stock Photo
    Kidney glomeruli. Coloured scanning electron micrograph (SEM) of a resin cast of glomeruli capillaries and the larger blood vessels supplying them with blood
    Illustration of pink stem cell on black background. — Stock Photo
    Illustration of pink stem cell on black background.
    Set of 46 human chromosomes on white background. — Stock Photo
    Set of 46 human chromosomes on white background.
    Stachybotrys fungus on black background, digital illustration. — Stock Photo
    Stachybotrys fungus on black background, digital illustration.
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Pathological anatomy of atherosclerosis — Stock Photo
    Pathological anatomy of atherosclerosis
    Flush toilet microbes on contaminated surface, conceptual digital illustration on white background. — Stock Photo
    Flush toilet microbes on contaminated surface, conceptual digital illustration on white background.
    3d illustration of sperm cells moving towards human womb. — Stock Photo
    3d illustration of sperm cells moving towards human womb.
    Neutrophil is a granulocyte, a part of the innate immune system. — Stock Photo
    Neutrophil is a granulocyte, a part of the innate immune system.
    Magnified digital illustration of megakaryocyte cell. — Stock Photo
    Magnified digital illustration of megakaryocyte cell.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Microscopic dust mites colony — Stock Photo
    Microscopic dust mites colony
    Salmonella typhimurium bacterium — Stock Photo
    Salmonella typhimurium bacterium
    3d illustration of human sperm cells in reproductive process. — Stock Photo
    3d illustration of human sperm cells in reproductive process.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Pleurotaenium desmid bacteria — Stock Photo
    Pleurotaenium desmid bacteria
    Influenza virus structure — Stock Photo
    Influenza virus structure
    Giardia lamblia flagellated protozoan parasite, digital illustration. — Stock Photo
    Giardia lamblia flagellated protozoan parasite, digital illustration.
    Digital illustration of human nerve cell with dendrites. — Stock Photo
    Digital illustration of human nerve cell with dendrites.
    Brain-eating amoeba Naegleria fowleri protozoans in trophozoite form, digital illustration. — Stock Photo
    Brain-eating amoeba Naegleria fowleri protozoans in trophozoite form, digital illustration.
    3d illustration of neuron anatomy and stricture with descriptions. — Stock Photo
    3d illustration of neuron anatomy and stricture with descriptions.
    3d illustration of blue rod-shaped bacteria. — Stock Photo
    3d illustration of blue rod-shaped bacteria.
    Adult Pubic louse on hair — Stock Photo
    Adult Pubic louse on hair
    Illustration of human nervous receptors on black background. — Stock Photo
    Illustration of human nervous receptors on black background.
    Microscopic Dust mites on floor — Stock Photo
    Microscopic Dust mites on floor
    Artwork of plasma cells — Stock Photo
    Artwork of plasma cells
    Coloured scanning electron micrograph of breast cancer cells. — Stock Photo
    Coloured scanning electron micrograph of breast cancer cells.
    Colored scanning electron micrograph of surface of human fallopian tube with epithelium of columnar cells with cilia. — Stock Photo
    Colored scanning electron micrograph of surface of human fallopian tube with epithelium of columnar cells with cilia.
    Blue cancer cells, digital illustration. — Stock Photo
    Blue cancer cells, digital illustration.
    Streptococcus pneumoniae bacteria (pneumococci), computer illustration. These Gram-positive spherical bacteria are usually found in pairs. They colonize respiratory tract asymptomatically in healthy carriers, but can cause pneumonia — Stock Photo
    Streptococcus pneumoniae bacteria (pneumococci), computer illustration. These Gram-positive spherical bacteria are usually found in pairs. They colonize respiratory tract asymptomatically in healthy carriers, but can cause pneumonia
    Illustration of human blood cells on black background. — Stock Photo
    Illustration of human blood cells on black background.
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system. — Stock Photo
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system.
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli — Stock Photo
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli
    Corynebacterium diphtheriae, computer illustration. C. diphtheriae is a gram-positive rod-shaped bacterium which is transmitted by respiratory droplets and causes the disease diphtheria — Stock Photo
    Corynebacterium diphtheriae, computer illustration. C. diphtheriae is a gram-positive rod-shaped bacterium which is transmitted by respiratory droplets and causes the disease diphtheria
    3d rendered illustration of human nerve cell on black background. — Stock Photo
    3d rendered illustration of human nerve cell on black background.
    Digital illustration of human cells on blue background. — Stock Photo
    Digital illustration of human cells on blue background.
    Digital illustration of intestinal parasitic tapeworm head with suckers. — Stock Photo
    Digital illustration of intestinal parasitic tapeworm head with suckers.
    Colored illustration of nerve cell on dark background. — Stock Photo
    Colored illustration of nerve cell on dark background.
    Tapeworm parasites in intestines — Stock Photo
    Tapeworm parasites in intestines