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    Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (red) are seen in the heads. Zebrafish eggs are transparent — Stock Photo
    Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (red) are seen in the heads. Zebrafish eggs are transparent
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory — Stock Photo
    African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory
    Zika virus particles — Stock Photo
    Zika virus particles
    Colored scanning electron micrograph of scales from silverfish insect living fossil. — Stock Photo
    Colored scanning electron micrograph of scales from silverfish insect living fossil.
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Normal skull anatomy of young adult — Stock Photo
    Normal skull anatomy of young adult
    Roquefort cheese and digital illustration of fungus Penicillium roqueforti. — Stock Photo
    Roquefort cheese and digital illustration of fungus Penicillium roqueforti.
    Influenza viruses budding from host cell — Stock Photo
    Influenza viruses budding from host cell
    PC12 neurone in culture — Stock Photo
    PC12 neurone in culture
    Fractured arm, coloured X-ray. — Stock Photo
    Fractured arm, coloured X-ray.
    Immature dog sperm — Stock Photo
    Immature dog sperm
    Young vain man in stylish wear with long nails standing on tiled wall looking at camera — Stock Photo
    Young vain man in stylish wear with long nails standing on tiled wall looking at camera
    Lungs with Legionnaires disease and close-up of Legionella pneumophila bacteria, conceptual illustration. — Stock Photo
    Lungs with Legionnaires disease and close-up of Legionella pneumophila bacteria, conceptual illustration.
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Cardiac muscle from a healthy heart — Stock Photo
    Cardiac muscle from a healthy heart
    Digital illustration of cell in early stage of programmed cell death. — Stock Photo
    Digital illustration of cell in early stage of programmed cell death.
    Coloured scanning electron micrograph of breast cancer cell. — Stock Photo
    Coloured scanning electron micrograph of breast cancer cell.
    Protozoan infection in human intestinal lumen — Stock Photo
    Protozoan infection in human intestinal lumen
    Roquefort cheese and digital illustration of fungus Penicillium roqueforti. — Stock Photo
    Roquefort cheese and digital illustration of fungus Penicillium roqueforti.
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    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.
    Total hip replacement, — Stock Photo
    Total hip replacement,
    Colored scanning electron micrograph of starch grains in seed of legume. — Stock Photo
    Colored scanning electron micrograph of starch grains in seed of legume.
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Normal skull structure of young adult — Stock Photo
    Normal skull structure of young adult
    Osteoarthritis of the hip — Stock Photo
    Osteoarthritis of the hip
    Fractured pancreas tissue — Stock Photo
    Fractured pancreas tissue
    Colored scanning electron micrograph of immature pig sperm from epididymis. — Stock Photo
    Colored scanning electron micrograph of immature pig sperm from epididymis.
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Dividing prostate gland cancer cells, colored scanning electron micrograph. — Stock Photo
    Dividing prostate gland cancer cells, colored scanning electron micrograph.
    Gastrotrich eggs. Coloured scanning electron micrograph (SEM) of a Chaetonotus sp. gastrotrich eggs. Gastrotrichs are microscopic, worm-like animals found in both freshwater and marine habitats — Stock Photo
    Gastrotrich eggs. Coloured scanning electron micrograph (SEM) of a Chaetonotus sp. gastrotrich eggs. Gastrotrichs are microscopic, worm-like animals found in both freshwater and marine habitats
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Human lip. Coloured scanning electron micrograph (SEM) of a human lip, showing sweat gland openings on the drier external lip surface. These openings (pores) release sweat onto the surface of the skin — Stock Photo
    Human lip. Coloured scanning electron micrograph (SEM) of a human lip, showing sweat gland openings on the drier external lip surface. These openings (pores) release sweat onto the surface of the skin
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Nanostructures formed on nickel surface — Stock Photo
    Nanostructures formed on nickel surface
    Total hip replacement, — Stock Photo
    Total hip replacement,
    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.
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines — Stock Photo
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines
    Dentist showing set of model teeth to patient in dental clinic — Stock Photo
    Dentist showing set of model teeth to patient in dental clinic
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Yellow brain tumour on magnetic resonance imaging scan, illustration. — Stock Photo
    Yellow brain tumour on magnetic resonance imaging scan, illustration.
    Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaskan stream during autumn; Alaska, United States of America — Stock Photo
    Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaskan stream during autumn; Alaska, United States of America
    Marine pennate diatom frustule — Stock Photo
    Marine pennate diatom frustule
    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
    Pyoderma skin disease — Stock Photo
    Pyoderma skin disease
    Crop unrecognizable trendy homosexual man with tattoo in form of snake and manicure on brown background — Stock Photo
    Crop unrecognizable trendy homosexual man with tattoo in form of snake and manicure on brown background
    Red blood cells — Stock Photo
    Red blood cells
    Side view of trendy homosexual man with long nails in ornamental shirt looking at camera while squatting on pavement against wall — Stock Photo
    Side view of trendy homosexual man with long nails in ornamental shirt looking at camera while squatting on pavement against wall
    Colored X-ray of section through thoracic spine of senior male patient with ankylosing spondylitis with severe degeneration of lower thoracic spine. — Stock Photo
    Colored X-ray of section through thoracic spine of senior male patient with ankylosing spondylitis with severe degeneration of lower thoracic spine.
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Intestinal microvilli. Coloured scanning electron micrograph (SEM) of microvilli from the small intestine. These tiny structures form a dense brush-like covering on the absorptive surfaces of the cells lining the small intestine — Stock Photo
    Intestinal microvilli. Coloured scanning electron micrograph (SEM) of microvilli from the small intestine. These tiny structures form a dense brush-like covering on the absorptive surfaces of the cells lining the small intestine
    Coloured chest X-ray showing aspiration (dark areas) in the lungs of a 76-year-old female patient with an extensive brain haemorrhage. — Stock Photo
    Coloured chest X-ray showing aspiration (dark areas) in the lungs of a 76-year-old female patient with an extensive brain haemorrhage.
    Stick insect foot — Stock Photo
    Stick insect foot
    Coloured scanning electron micrograph of tardigrade water bear. — Stock Photo
    Coloured scanning electron micrograph of tardigrade water bear.
    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
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Tendon, coloured scanning electron micrograph showing bundles of collagen fibres. — Stock Photo
    Tendon, coloured scanning electron micrograph showing bundles of collagen fibres.
    Coloured X-ray of the foot of a 22-year-old male patient with a spur (osteophyte, highlighted) affecting the tibia (shin bone). — Stock Photo
    Coloured X-ray of the foot of a 22-year-old male patient with a spur (osteophyte, highlighted) affecting the tibia (shin bone).