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    Illustration of giardia parasites on blue background. — Stock Photo
    Illustration of giardia parasites on blue background.
    3d illustration of white blood cells leukocytes in human body. — Stock Photo
    3d illustration of white blood cells leukocytes in human body.
    Freeze-fractured lens of an eye — Stock Photo
    Freeze-fractured lens of an eye
    Illustration of human blood cells on black background. — Stock Photo
    Illustration of human blood cells on black background.
    Activation of T-cell immune response, illustration. — Stock Photo
    Activation of T-cell immune response, illustration.
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats — Stock Photo
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats
    Rotavirus particles infecting human intestine, digital artwork. — Stock Photo
    Rotavirus particles infecting human intestine, digital artwork.
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem. — Stock Photo
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem.
    Female technician storing Petri dishes in incubator fridge. — Stock Photo
    Female technician storing Petri dishes in incubator fridge.
    Ant head. Coloured scanning electron micrograph (SEM) of the head of an ant (family Formicidae). showing its large compound eyes (red) and jaws. Magnification: x50 when printed 10 centimetres wide. — Stock Photo
    Ant head. Coloured scanning electron micrograph (SEM) of the head of an ant (family Formicidae). showing its large compound eyes (red) and jaws. Magnification: x50 when printed 10 centimetres wide.
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Computer illustration of unicellular fungus (yeast) Candida auris — Stock Photo
    Computer illustration of unicellular fungus (yeast) Candida auris
    White blood cells, digital illustration. — Stock Photo
    White blood cells, digital illustration.
    Destruction of a human embryo — Stock Photo
    Destruction of a human embryo
    Purkinje cells and their dendritic processes — Stock Photo
    Purkinje cells and their dendritic processes
    Lassa virus particles, digital illustration. — Stock Photo
    Lassa virus particles, digital illustration.
    Neutrophil in human blood, computer illustration. — Stock Photo
    Neutrophil in human blood, computer illustration.
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Illustration of process leading to formation of amyloid protein plaques on neurons in Alzheimer disease. — Stock Photo
    Illustration of process leading to formation of amyloid protein plaques on neurons in Alzheimer disease.
    3d illustration of cancer cell in process of dividing. — Stock Photo
    3d illustration of cancer cell in process of dividing.
    Flu virus in trachea, digital illustration. — Stock Photo
    Flu virus in trachea, digital illustration.
    Primula pollen grain — Stock Photo
    Primula pollen grain
    Animal cells with mitochondria, digital illustration. — Stock Photo
    Animal cells with mitochondria, digital 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.
    Human lung tissue, light micrograph. Lungs are the primary organs of the respiratory system in humans and many other animals. Haematoxylin and eosin stain. — Stock Photo
    Human lung tissue, light micrograph. Lungs are the primary organs of the respiratory system in humans and many other animals. Haematoxylin and eosin stain.
    Liver tissue, light micrograph. Animal tissue. — Stock Photo
    Liver tissue, light micrograph. Animal tissue.
    Human compact bone tissue, light micrograph. — Stock Photo
    Human compact bone tissue, light micrograph.
    Simple squamous epithelium, digital illustration. — Stock Photo
    Simple squamous epithelium, digital illustration.
    Digital illustration showing destruction of lymphoblast cells, acute lymphoblastic leukaemia treatment concept. — Stock Photo
    Digital illustration showing destruction of lymphoblast cells, acute lymphoblastic leukaemia treatment concept.
    Red blood cells on white background, digital illustration. — Stock Photo
    Red blood cells on white background, digital illustration.
    Macrophage foam cells containing lipid droplets, digital illustration. — Stock Photo
    Macrophage foam cells containing lipid droplets, digital illustration.
    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.
    Ovary. Light micrograph (LM) of section through whole ovary. Cortex (outer region) contains numerous corpora lutea (pink) and follicles (purple) at various stages of development — Stock Photo
    Ovary. Light micrograph (LM) of section through whole ovary. Cortex (outer region) contains numerous corpora lutea (pink) and follicles (purple) at various stages of development
    3d illustration of red blood cells erythrocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes.
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Normal sperm cells — Stock Photo
    Normal sperm cells
    Computer illustration of bacteria on the surface of intestinal villi — Stock Photo
    Computer illustration of bacteria on the surface of intestinal villi
    T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus — Stock Photo
    T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Red blood cells and platelets, computer illustration. — Stock Photo
    Red blood cells and platelets, computer illustration.
    Balamuthia mandrillaris amoeba organisms, digital illustration. — Stock Photo
    Balamuthia mandrillaris amoeba organisms, digital illustration.
    Nipah virus in lungs, conceptual computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs — Stock Photo
    Nipah virus in lungs, conceptual computer illustration. Nipah virus is zoonotic (transmitted to humans from animals) and was first found in Malaysia and Singapore in people who had close contact with pigs
    Red blood cells — Stock Photo
    Red blood cells
    Activated macrophage attacking bacteria — Stock Photo
    Activated macrophage attacking bacteria
    Illustration of 8 cell stage egg on blue background. — Stock Photo
    Illustration of 8 cell stage egg on blue background.
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Digital illustration of Neisseria gonorrhoeae bacteria inside neutrophil white blood cells. — Stock Photo
    Digital illustration of Neisseria gonorrhoeae bacteria inside neutrophil white blood cells.
    Egg cells on white background, digital illustration. — Stock Photo
    Egg cells on white background, digital illustration.
    Transparent cells on purple background, digital illustration. — Stock Photo
    Transparent cells on purple background, digital illustration.
    Axon connections between cells — Stock Photo
    Axon connections between cells
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    Cancer cell structure and shape — Stock Photo
    Cancer cell structure and shape
    Nudaurelia capensis omega virus particles — Stock Photo
    Nudaurelia capensis omega virus particles
    B cell and antibodies, computer illustration — Stock Photo
    B cell and antibodies, computer illustration