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    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    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.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Paranasal sinus epithelium — Stock Photo
    Paranasal sinus epithelium
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Trachea lined with ciliated columnar epithelium — Stock Photo
    Trachea lined with ciliated columnar epithelium
    Colon lining and mucous producing cells — Stock Photo
    Colon lining and mucous producing cells
    Coloured scanning electron micrograph (SEM) of the surface of a squamous epithelial cell from the ureter. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the surface of a squamous epithelial cell from the ureter.
    Playful friends in zip line equipment posing — Stock Photo
    Playful friends in zip line equipment posing
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Gall bladder lining — Stock Photo
    Gall bladder lining
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Colon lining and mucous producing cells — Stock Photo
    Colon lining and mucous producing cells
    Section through the olfactory epithelium — Stock Photo
    Section through the olfactory epithelium
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red).
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    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.
    Happy woman zip lining above trees — Stock Photo
    Happy woman zip lining above trees
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Epithelial lining of Fallopian tube — Stock Photo
    Epithelial lining of Fallopian tube
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Woman with camera phone photographing friends in zip line equipment — Stock Photo
    Woman with camera phone photographing friends in zip line equipment
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Osteoclast, computer illustration, colorful image — Stock Photo
    Osteoclast, computer illustration, colorful image
    Lining of the small intestine — Stock Photo
    Lining of the small intestine
    Section through the olfactory epithelium — Stock Photo
    Section through the olfactory epithelium
    Woman with smart phone photographing man preparing zip line equipment — Stock Photo
    Woman with smart phone photographing man preparing zip line equipment
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine