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    Narrowed blood vessel, computer illustration. — Stock Photo
    Narrowed blood vessel, computer illustration.
    Fat cells and supportive connective tissue — Stock Photo
    Fat cells and supportive connective tissue
    Pseudostratified columnar epithelium, digital illustration. — Stock Photo
    Pseudostratified columnar epithelium, digital illustration.
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times — Stock Photo
    Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times
    Human Fertilisation, computer illustration — Stock Photo
    Human Fertilisation, computer illustration
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    3d illustration of blood cells and Plasmodium parasites causing malaria. — Stock Photo
    3d illustration of blood cells and Plasmodium parasites causing malaria.
    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.
    Phlox pollen grain — Stock Photo
    Phlox pollen grain
    Macrophage foam cells containing lipid droplets, digital illustration. — Stock Photo
    Macrophage foam cells containing lipid droplets, digital illustration.
    Close-up of hand of cell biologist holding flask of stem cells cultivated in red growth medium. — Stock Photo
    Close-up of hand of cell biologist holding flask of stem cells cultivated in red growth medium.
    Illustration of a dendritic cell, a type of white blood cell that is a component of the body's immune system — Stock Photo
    Illustration of a dendritic cell, a type of white blood cell that is a component of the body's immune system
    Illustration of human skin anatomy on white background. — Stock Photo
    Illustration of human skin anatomy on white background.
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease — Stock Photo
    Alzheimer's disease. Illustration of amyloid plaques amongst neurons and neurofibrillary tangles inside neurons. Amyloid plaques are characteristic features of Alzheimer's disease
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Sperm cells in seminiferous tubules — Stock Photo
    Sperm cells in seminiferous tubules
    Digital illustration of pollen grains on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grains on anther of Chinese hibiscus flower.
    Hypodermic needle and blood, computer illustration — Stock Photo
    Hypodermic needle and blood, computer illustration
    Examining cultured cells under microscope, close-up. — Stock Photo
    Examining cultured cells under microscope, close-up.
    Red blood cells — Stock Photo
    Red blood cells
    Human sperm cells — Stock Photo
    Human sperm cells
    Abstract structure of neural network on dark background, digital illustration. — Stock Photo
    Abstract structure of neural network on dark background, digital illustration.
    Animal cells during cytokinesis (cell division), illustration — Stock Photo
    Animal cells during cytokinesis (cell division), illustration
    3d illustration of human sperm cells in reproductive process. — Stock Photo
    3d illustration of human sperm cells in reproductive process.
    Digital artwork of white blood cells attacking green illuminated cancer cell. — Stock Photo
    Digital artwork of white blood cells attacking green illuminated cancer cell.
    Bacterial brain infection. Conceptual computer illustration showing Streptococcus pneumoniae bacteria, one of the main causes of bacterial meningitis and meningoencephalitis, infecting brain cells — Stock Photo
    Bacterial brain infection. Conceptual computer illustration showing Streptococcus pneumoniae bacteria, one of the main causes of bacterial meningitis and meningoencephalitis, infecting brain cells
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Digital illustration of green cancer cells. — Stock Photo
    Digital illustration of green cancer cells.
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    Colored digital illustration of cancer cells. — Stock Photo
    Colored digital illustration of cancer cells.
    White blood cells, digital illustration. — Stock Photo
    White blood cells, digital illustration.
    Bacterial encephalitis. Conceptual computer illustration showing bacteria infecting brain cells — Stock Photo
    Bacterial encephalitis. Conceptual computer illustration showing bacteria infecting brain cells
    Cancer cell morphology — Stock Photo
    Cancer cell morphology
    Abstract animal cells, digital illustration. — Stock Photo
    Abstract animal cells, digital illustration.
    Ciliated cells, digital illustration. — Stock Photo
    Ciliated cells, digital illustration.
    Illustration of eosinophil white blood cell with purple lobed nuclei. — Stock Photo
    Illustration of eosinophil white blood cell with purple lobed nuclei.
    Layer of cells, computer illustration — Stock Photo
    Layer of cells, computer illustration
    Illustration of eosinophil white blood cell with purple lobed nuclei. — Stock Photo
    Illustration of eosinophil white blood cell with purple lobed nuclei.
    Cancer cells dividing — Stock Photo
    Cancer cells dividing
    Female technician storing Petri dishes in incubator fridge. — Stock Photo
    Female technician storing Petri dishes in incubator fridge.
    Bacteria cells on white background, digital illustration. — Stock Photo
    Bacteria cells on white background, digital illustration.
    PC12 neurone in culture — Stock Photo
    PC12 neurone in culture
    Illustration of enzymes driving synthesis of energy-carrying molecule ATP. — Stock Photo
    Illustration of enzymes driving synthesis of energy-carrying molecule ATP.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Virus in human blood, computer illustration. — Stock Photo
    Virus in human blood, computer illustration.
    Pyramidal neurons (nerve cells) of human brain frontal cortex, computer illustration — Stock Photo
    Pyramidal neurons (nerve cells) of human brain frontal cortex, computer illustration
    Coloured scanning electron micrograph of ovarian cancer cells. — Stock Photo
    Coloured scanning electron micrograph of ovarian cancer cells.
    Zika virus particles transmitted by mosquito bite, digital illustration. — Stock Photo
    Zika virus particles transmitted by mosquito bite, digital illustration.
    Purkinje cells and their dendritic processes — Stock Photo
    Purkinje cells and their dendritic processes
    Red blood cells — Stock Photo
    Red blood cells
    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.
    Genetic engineering, conceptual illustration. — Stock Photo
    Genetic engineering, conceptual illustration.
    Pathological anatomy of atherosclerosis — Stock Photo
    Pathological anatomy of atherosclerosis
    Neutrophil and monocyte white blood cells in blood smear, digital illustration. — Stock Photo
    Neutrophil and monocyte white blood cells in blood smear, digital illustration.
    Light micrograph of an artery vascular cross section. — Stock Photo
    Light micrograph of an artery vascular cross section.
    Cardiac muscle cells, digital illustration. — Stock Photo
    Cardiac muscle cells, digital illustration.
    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.