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    Digital illustration of human digestive system and microscopic images of bacteria. — Stock Photo
    Digital illustration of human digestive system and microscopic images of bacteria.
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre. — Stock Photo
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre.
    Acinar pancreatic cell — Stock Photo
    Acinar pancreatic cell
    Micrograph of tendon fibres — Stock Photo
    Micrograph of tendon fibres
    Salmonella typhimurium bacterium — Stock Photo
    Salmonella typhimurium bacterium
    House dust mites — Stock Photo
    House dust mites
    Hair follicles of human skin — Stock Photo
    Hair follicles of human skin
    Blood clot structure — Stock Photo
    Blood clot structure
    Blood clotting in an ovarian follicle — Stock Photo
    Blood clotting in an ovarian follicle