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    Digital illustration of pollen grain on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grain on anther of Chinese hibiscus flower.
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Acinar pancreatic cell — Stock Photo
    Acinar pancreatic cell
    Deformed sperm cell — Stock Photo
    Deformed sperm cell
    Human hair shafts, digital illustration. — Stock Photo
    Human hair shafts, digital illustration.
    Coloured frontal X-ray of a blocked intestine (upper centre). — Stock Photo
    Coloured frontal X-ray of a blocked intestine (upper centre).
    Thyroid gland showing the follicles — Stock Photo
    Thyroid gland showing the follicles
    Normal head and brain, MRI scan — Stock Photo
    Normal head and brain, MRI scan
    Colored scanning electron micrograph of osteoblast osteocyte bone cell. — Stock Photo
    Colored scanning electron micrograph of osteoblast osteocyte bone cell.
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte. — Stock Photo
    Colored scanning electron micrograph of human red blood cells erythrocytes, white blood cells leukocytes and platelet thrombocyte.
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus 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.
    Human hair shafts, digital illustration. — Stock Photo
    Human hair shafts, digital illustration.
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue.
    Red blood cells — Stock Photo
    Red blood cells
    Digital artwork of T-lymphocyte cells attacking red cancer cell. — Stock Photo
    Digital artwork of T-lymphocyte cells attacking red cancer cell.
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium
    House dust mites — Stock Photo
    House dust mites
    Digital illustration of bacteria on tip of needle. — Stock Photo
    Digital illustration of bacteria on tip of needle.
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar. — Stock Photo
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar.
    Prosthetic knee joint — Stock Photo
    Prosthetic knee joint
    Fat cells and supportive connective tissue — Stock Photo
    Fat cells and supportive connective tissue
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Brain with aneurysm in the middle cerebral artery — Stock Photo
    Brain with aneurysm in the middle cerebral artery
    Lymphoma cancer cell — Stock Photo
    Lymphoma cancer cell
    Leech, coloured scanning electron micrograph (SEM). — Stock Photo
    Leech, coloured scanning electron micrograph (SEM).
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (yellow) — Stock Photo
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (yellow)
    Coloured scanning electron micrograph (SEM) of the interior of bone from a bird skull. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the interior of bone from a bird skull.
    Shoulder and elbow joints anatomy — Stock Photo
    Shoulder and elbow joints anatomy
    Cardiac muscle from a healthy heart — Stock Photo
    Cardiac muscle from a healthy heart
    Mycobacterium smegmatis bacteria — Stock Photo
    Mycobacterium smegmatis bacteria
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Piece of cake with close-up of Staphylococcus bacteria, food poisoning conceptual illustration. — Stock Photo
    Piece of cake with close-up of Staphylococcus bacteria, food poisoning conceptual illustration.