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    Coloured profile X-ray of fixation devices (white) in the bones of the knee, used to hold the anterior cruciate ligament (not seen) in place. — Stock Photo
    Coloured profile X-ray of fixation devices (white) in the bones of the knee, used to hold the anterior cruciate ligament (not seen) in place.
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Leech, coloured scanning electron micrograph (SEM). — Stock Photo
    Leech, coloured scanning electron micrograph (SEM).
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Degenerative foot deformation — Stock Photo
    Degenerative foot deformation
    Cambie Bridge in city skyline with stadium at False Creek, Vancouver, British Columbia, Canada — Stock Photo
    Cambie Bridge in city skyline with stadium at False Creek, Vancouver, British Columbia, Canada
    False clownfish in anemone — Stock Photo
    False clownfish in anemone
    Patient with a heart pacemaker — Stock Photo
    Patient with a heart pacemaker
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    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.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    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
    Hip before hip replacement surgery, X-ray — Stock Photo
    Hip before hip replacement surgery, X-ray
    Zika virus particles — Stock Photo
    Zika virus particles
    Acinar pancreatic cell — Stock Photo
    Acinar pancreatic cell
    False clownfish swimming over anemone — Stock Photo
    False clownfish swimming over anemone
    Grasses, coloured X-ray, radiology scan — Stock Photo
    Grasses, coloured X-ray, radiology scan
    Red colored computed tomography scan of brain section of senior female patient with glioblastoma brain cancer. — Stock Photo
    Red colored computed tomography scan of brain section of senior female patient with glioblastoma brain cancer.
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Passion flower pollen — Stock Photo
    Passion flower pollen
    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.
    Caenorhabditis elegans parasite worm, colored scanning electron micrograph. — Stock Photo
    Caenorhabditis elegans parasite worm, colored scanning electron micrograph.
    Normal skull structure of young adult — Stock Photo
    Normal skull structure of young adult
    Human skeleton showing kidneys and nervous system — Stock Photo
    Human skeleton showing kidneys and nervous system