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    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow) — Stock Photo
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow)
    Human hair shafts, computer illustration — Stock Photo
    Human hair shafts, computer illustration
    Coloured scanning electron micrograph (SEM) of the inner lining of the stomach (gastric mucosa). — Stock Photo
    Coloured scanning electron micrograph (SEM) of the inner lining of the stomach (gastric mucosa).
    Acute pyelonephritis, computer illustration and light micrograph — Stock Photo
    Acute pyelonephritis, computer illustration and light micrograph
    Medical illustration of human cell structure on white background. — Stock Photo
    Medical illustration of human cell structure on white background.
    Medical artwork of healthy intestinal villi in digestive system. — Stock Photo
    Medical artwork of healthy intestinal villi in digestive system.
    Lung cancer, digital illustration and light micrograph of cancerous tissue. — Stock Photo
    Lung cancer, digital illustration and light micrograph of cancerous tissue.
    Human hair shafts, digital illustration. — Stock Photo
    Human hair shafts, digital illustration.
    Medical artwork showing intestinal villi in bowel. — Stock Photo
    Medical artwork showing intestinal villi in bowel.
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs — Stock Photo
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs
    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
    Light micrograph showing cross section of lichen and fungi. — Stock Photo
    Light micrograph showing cross section of lichen and fungi.
    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.
    Human hair shafts, computer illustration — Stock Photo
    Human hair shafts, computer illustration
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Acute pyelonephritis, computer illustration and light micrograph — Stock Photo
    Acute pyelonephritis, computer illustration and light micrograph
    Simple columnar epithelium, digital illustration. — Stock Photo
    Simple columnar epithelium, digital illustration.
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant — Stock Photo
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant
    Immature parasitic trematode — Stock Photo
    Immature parasitic trematode
    Medical illustration of human cell structure on dark background. — Stock Photo
    Medical illustration of human cell structure on dark background.
    Sperm cells in seminiferous tubule — Stock Photo
    Sperm cells in seminiferous tubule
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Medical illustration of human cell structure on black background. — Stock Photo
    Medical illustration of human cell structure on black background.
    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
    Human cardiac muscle, light micrograph. — Stock Photo
    Human cardiac muscle, light micrograph.
    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail. — Stock Photo
    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail.
    Digital illustration of human cilia cells. — Stock Photo
    Digital illustration of human cilia cells.
    Illustration of intestinal probiotic bacteria. — Stock Photo
    Illustration of intestinal probiotic bacteria.
    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
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Human compact bone tissue, light micrograph. — Stock Photo
    Human compact bone tissue, light micrograph.
    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
    Purkinje cell of brain cerebellum, digital illustration. — Stock Photo
    Purkinje cell of brain cerebellum, digital illustration.
    Intestinal villi, computer illustration — Stock Photo
    Intestinal villi, computer illustration
    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
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with cirrhosis-associated hepatocellular nodules. — Stock Photo
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with cirrhosis-associated hepatocellular nodules.
    Medical illustration of human cell structure on white background. — Stock Photo
    Medical illustration of human cell structure on white background.
    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.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Light micrograph of a section through skin from the scalp. — Stock Photo
    Light micrograph of a section through skin from the scalp.
    X-ray of the head and human brain in concept of neural connections and electrical pulses. — Stock Photo
    X-ray of the head and human brain in concept of neural connections and electrical pulses.
    Medical illustration of human cell structure on black background. — Stock Photo
    Medical illustration of human cell structure on black background.
    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.
    Medical illustration of inflamed intestinal villi. — Stock Photo
    Medical illustration of inflamed intestinal villi.
    Cross-section of human scalp tissue, light micrograph. — Stock Photo
    Cross-section of human scalp tissue, light micrograph.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Simple cuboidal epithelium, digital illustration. — Stock Photo
    Simple cuboidal epithelium, digital illustration.
    Human hair shafts, computer illustration — Stock Photo
    Human hair shafts, computer illustration
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph. — Stock Photo
    Heart capillary with red blood cell between muscle fibres, colored scanning electron 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.
    Lung cancer, digital illustration and light micrograph of cancerous tissue. — Stock Photo
    Lung cancer, digital illustration and light micrograph of cancerous tissue.
    Osteoporotic bone abnormality — Stock Photo
    Osteoporotic bone abnormality
    Light micrograph (LM) showing blood supply to muscle fibers. — Stock Photo
    Light micrograph (LM) showing blood supply to muscle fibers.
    Structure of compact bone, light micrograph. — Stock Photo
    Structure of compact bone, light micrograph.
    Researcher holding a petri dish — Stock Photo
    Researcher holding a petri dish
    Scientist viewing bacteria cultures — Stock Photo
    Scientist viewing bacteria cultures
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Colony of Listeria sp. bacteria — Stock Photo
    Colony of Listeria sp. bacteria
    Hair shafts growing from human skin — Stock Photo
    Hair shafts growing from human skin
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow) — Stock Photo
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow)