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    Human brain with close-up view of neurons, computer illustration. — Stock Photo
    Human brain with close-up view of neurons, computer illustration.
    Medical illustration of inflamed intestinal villi. — Stock Photo
    Medical illustration of inflamed intestinal villi.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding-pattern of the muscle fibrils is seen — Stock Photo
    Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding-pattern of the muscle fibrils is seen
    Human brain with close-up view of neurons, computer illustration. — Stock Photo
    Human brain with close-up view of neurons, computer illustration.
    Cross-section of spinal cord, light micrograph. — Stock Photo
    Cross-section of spinal cord, light micrograph.
    Section of a muscular artery — Stock Photo
    Section of a muscular artery
    Cross-section of spinal cord, light micrograph. — Stock Photo
    Cross-section of spinal cord, light micrograph.
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Crystalline lens of the eye — Stock Photo
    Crystalline lens of the eye
    Hair shafts growing from human skin — Stock Photo
    Hair shafts growing from human skin
    Cross-section of human scalp tissue, light micrograph. — Stock Photo
    Cross-section of human scalp tissue, light micrograph.
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Lung cancer, digital illustration and light micrograph of cancerous tissue. — Stock Photo
    Lung cancer, digital illustration and light micrograph of cancerous tissue.
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Human compact bone tissue, light micrograph. — Stock Photo
    Human compact bone tissue, light micrograph.
    Sciatic nerve showing a bundle of nerve fibres — Stock Photo
    Sciatic nerve showing a bundle of nerve fibres
    Medical illustration of healthy intestinal villi in gastrointestinal tract. — Stock Photo
    Medical illustration of healthy intestinal villi in gastrointestinal tract.
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells — Stock Photo
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells
    Retina. Light micrograph (LM) of a section through a retina. The eye works by allowing light to be focused by the lens onto the retina — Stock Photo
    Retina. Light micrograph (LM) of a section through a retina. The eye works by allowing light to be focused by the lens onto the retina
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes. — Stock Photo
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes.
    Bone marrow cellular structure — Stock Photo
    Bone marrow cellular structure
    Human brain with highlighted pons and neurons, illustration. Human brain with highlighted pons Varolii and close-up view of pyramidal neurons (nerve cells) located in pons — Stock Photo
    Human brain with highlighted pons and neurons, illustration. Human brain with highlighted pons Varolii and close-up view of pyramidal neurons (nerve cells) located in pons
    Colored scanning electron micrograph of cancellous bone tissue from starling bird skull. — Stock Photo
    Colored scanning electron micrograph of cancellous bone tissue from starling bird skull.
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Plasma cell, computer illustration. Plasma cells, which are found in the blood and lymph, are mature B lymphocytes (white blood cells) that produce and secrete antibodies during an immune response. — Stock Photo
    Plasma cell, computer illustration. Plasma cells, which are found in the blood and lymph, are mature B lymphocytes (white blood cells) that produce and secrete antibodies during an immune response.
    Digital illustration and light micrograph of squamous cell carcinoma of lung. — Stock Photo
    Digital illustration and light micrograph of squamous cell carcinoma of lung.
    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.
    Bird bone tissue — Stock Photo
    Bird bone tissue
    Coloured scanning electron micrograph (SEM) of a section through a muscle fibre. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a muscle fibre.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    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
    Human cardiac muscle, light micrograph. — Stock Photo
    Human cardiac muscle, light micrograph.
    Human hair shafts, digital illustration. — Stock Photo
    Human hair shafts, digital illustration.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Human hair shafts, computer illustration — Stock Photo
    Human hair shafts, computer illustration
    Osteoporotic bone abnormality — Stock Photo
    Osteoporotic bone abnormality
    Acute pyelonephritis, computer illustration and light micrograph — Stock Photo
    Acute pyelonephritis, computer illustration and light micrograph
    Human intestinal villi, computer illustration. — Stock Photo
    Human intestinal villi, computer illustration.
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen. — Stock Photo
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen.
    Hair shafts growing from human skin — Stock Photo
    Hair shafts growing from human skin
    Epithelium from a fallopian tube — Stock Photo
    Epithelium from a fallopian tube
    Developing pig eye — Stock Photo
    Developing pig eye
    Sperm cells in seminiferous tubule — Stock Photo
    Sperm cells in seminiferous tubule
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut — Stock Photo
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut
    Section through the cerebellum of the brain — Stock Photo
    Section through the cerebellum of the brain
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Human brain with highlighted pons and neurons, illustration. Human brain with highlighted pons Varolii and close-up view of pyramidal neurons (nerve cells) located in pons — Stock Photo
    Human brain with highlighted pons and neurons, illustration. Human brain with highlighted pons Varolii and close-up view of pyramidal neurons (nerve cells) located in pons
    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.
    Simple columnar epithelium, light micrograph — Stock Photo
    Simple columnar epithelium, light micrograph
    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.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    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.
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    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