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    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.
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration. — Stock Photo
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration.
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration. — Stock Photo
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration.
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration. — Stock Photo
    Lungs pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual illustration.
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Human cell, computer illustration. — Stock Photo
    Human cell, computer illustration.
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla). — Stock Photo
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla).
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (grey) and large intercellular air spaces (holes). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (grey) and large intercellular air spaces (holes).
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin.
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin.
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla). — Stock Photo
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla).
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (blue) and large intercellular air spaces (holes). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (blue) and large intercellular air spaces (holes).
    Coloured transmission electron micrograph (TEM) of a section through a Langerhans cell from the epidermis of the skin. — Stock Photo
    Coloured transmission electron micrograph (TEM) of a section through a Langerhans cell from the epidermis of the skin.
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Section through the cerebellum in the brain — Stock Photo
    Section through the cerebellum in the brain
    Section through bone marrow — Stock Photo
    Section through bone marrow
    Section through bone marrow — Stock Photo
    Section through bone marrow
    Bone marrow cellular structure — Stock Photo
    Bone marrow cellular structure
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Animal cell structure — Stock Photo
    Animal cell structure
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Cellular organelles and mitochondrion — Stock Photo
    Cellular organelles and mitochondrion
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Structure of animal cell — Stock Photo
    Structure of animal cell
    Cellular organelles and mitochondrion — Stock Photo
    Cellular organelles and mitochondrion
    Adipose tissue composed of adipocytes — Stock Photo
    Adipose tissue composed of adipocytes
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Adipocyte fat cell — Stock Photo
    Adipocyte fat cell
    Adipocyte fat cell — Stock Photo
    Adipocyte fat cell
    Adipose tissue composed of adipocytes — Stock Photo
    Adipose tissue composed of adipocytes
    Structure of animal cell — Stock Photo
    Structure of animal cell
    Structure of animal cell — Stock Photo
    Structure of animal cell
    Red blood cells with fibrin — Stock Photo
    Red blood cells with fibrin
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Epithelial lining of Fallopian tube — Stock Photo
    Epithelial lining of Fallopian tube
    Nerve cells and intercellular junctions — Stock Photo
    Nerve cells and intercellular junctions
    Nerve cell structure on plain background — Stock Photo
    Nerve cell structure on plain background
    Activated platelet cells — Stock Photo
    Activated platelet cells
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Neurone embedded in grey matter — Stock Photo
    Neurone embedded in grey matter
    Blood clot formed by red blood cells — Stock Photo
    Blood clot formed by red blood cells