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    Coloured scanning electron micrograph of surface of prostate cancer cells. — Stock Photo
    Coloured scanning electron micrograph of surface of prostate cancer cells.
    Destruction of a cancer cell by antibodies — Stock Photo
    Destruction of a cancer cell by antibodies
    3d illustration of red blood cells disintegrating. — Stock Photo
    3d illustration of red blood cells disintegrating.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Smiling businessman using cell phone in park — Stock Photo
    Smiling businessman using cell phone in park
    Microvilli of gallbladder surface — Stock Photo
    Microvilli of gallbladder surface
    HIV viruses infecting T-lymphocyte cell — Stock Photo
    HIV viruses infecting T-lymphocyte cell
    Papillae on the upper surface of a rose flower petal (Rosa sp), coloured scanning electron micrograph (SEM). — Stock Photo
    Papillae on the upper surface of a rose flower petal (Rosa sp), coloured scanning electron micrograph (SEM).
    3d illustration of several falling hairs that have detached from skin. — Stock Photo
    3d illustration of several falling hairs that have detached from skin.
    Large thunderstorm storm cell — Stock Photo
    Large thunderstorm storm cell
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa. — Stock Photo
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa.
    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.