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    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.
    Diseased bladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased bladder in abstract human body, conceptual digital illustration.
    Three dimensional medical illustration of male reproductive system with veins and arteries — Stock Photo
    Three dimensional medical illustration of male reproductive system with veins and arteries
    Illustration of transparent blue silhouette of male body with colored lungs. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored lungs.
    Pneumonia caused by bacteria Moraxella catarrhalis, digital illustration. — Stock Photo
    Pneumonia caused by bacteria Moraxella catarrhalis, digital illustration.
    Bacterial sinusitis, computer illustration. The sinuses are membrane-lined air-filled spaces in the bones of the face. The frontal sinuses are above the eyes. Below these are the many lobed ethmoid sinuses and behind them the sphenoid sinuses — Stock Photo
    Bacterial sinusitis, computer illustration. The sinuses are membrane-lined air-filled spaces in the bones of the face. The frontal sinuses are above the eyes. Below these are the many lobed ethmoid sinuses and behind them the sphenoid sinuses
    Human body model showing female anatomy with internal organs, digital 3d render illustration. — Stock Photo
    Human body model showing female anatomy with internal organs, digital 3d render illustration.
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    Human Bronchi, computer illustration — Stock Photo
    Human Bronchi, computer illustration
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Female anatomical model with yellow colored and visible lungs, computer illustration. — Stock Photo
    Female anatomical model with yellow colored and visible lungs, computer illustration.
    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.
    Illustration of visible colored lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible colored lungs in transparent human body silhouette.
    Human intestinal villi, computer illustration. — Stock Photo
    Human intestinal villi, computer illustration.
    Suburban community in San Mateo County, California, USA — Stock Photo
    Suburban community in San Mateo County, California, USA
    Microbiota of human intestine, abstract digital 3d illustration. — Stock Photo
    Microbiota of human intestine, abstract digital 3d illustration.
    Illustration of senior woman silhouette showing lungs on black background. — Stock Photo
    Illustration of senior woman silhouette showing lungs on black background.
    Mid section illustration of colon in male body silhouette. — Stock Photo
    Mid section illustration of colon in male body silhouette.
    Female abstract body with glowing breast cancer, conceptual computer illustration. — Stock Photo
    Female abstract body with glowing breast cancer, conceptual computer illustration.
    Human body model showing female anatomy with internal organs, digital 3d render illustration. — Stock Photo
    Human body model showing female anatomy with internal organs, digital 3d render illustration.
    Visible lungs in realistic female body 3d model on white background, computer illustration. — Stock Photo
    Visible lungs in realistic female body 3d model on white background, computer illustration.
    3D rendering of human lungs with respiratory tree and diaphragm — Stock Photo
    3D rendering of human lungs with respiratory tree and diaphragm
    Human large intestine tissue, light micrograph. — Stock Photo
    Human large intestine tissue, light micrograph.
    Large intestine, computer illustration — Stock Photo
    Large intestine, computer illustration
    Illustration of silhouette of obese man with highlighted lung tumor. — Stock Photo
    Illustration of silhouette of obese man with highlighted lung tumor.
    Human Colon, computer illustration — Stock Photo
    Human Colon, computer illustration
    Healthy intestinal villi — Stock Photo
    Healthy intestinal villi
    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.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Mycoplasma genitalium parasitic bacteria, digital illustration. — Stock Photo
    Mycoplasma genitalium parasitic bacteria, digital illustration.
    3d rendered illustration of colored female lungs in body silhouette. — Stock Photo
    3d rendered illustration of colored female lungs in body silhouette.
    Illustration of cancerous tumour in female lung. — Stock Photo
    Illustration of cancerous tumour in female lung.
    3D rendering of digestive and male reproductive systems — Stock Photo
    3D rendering of digestive and male reproductive systems
    Medical ilustration of an appendix with appendicitis — Stock Photo
    Medical ilustration of an appendix with appendicitis
    Digital illustration of rod-shaped bacteria inside alveoli of lung causing Bacterial pneumonia. — Stock Photo
    Digital illustration of rod-shaped bacteria inside alveoli of lung causing Bacterial pneumonia.
    Illustration of senior woman silhouette with colored colon on black background. — Stock Photo
    Illustration of senior woman silhouette with colored colon on black background.
    Digital illustration of ureters in senior man body. — Stock Photo
    Digital illustration of ureters in senior man body.
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract. — Stock Photo
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract.
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    3d rendered illustration of colored female bronchi in body silhouette. — Stock Photo
    3d rendered illustration of colored female bronchi in body silhouette.
    Blood pressure and circulatory system — Stock Photo
    Blood pressure and circulatory system
    Illustration of blue silhouette of obese woman with highlighted colon on white background. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted colon on white background.
    Illustration of digestive system in transparent male silhouette. — Stock Photo
    Illustration of digestive system in transparent male silhouette.
    Illustration of senior man silhouette with visible organs. — Stock Photo
    Illustration of senior man silhouette with visible organs.
    Polder or re-claimed lands, North Holland, Netherlands — Stock Photo
    Polder or re-claimed lands, North Holland, Netherlands
    Medical artwork showing intestinal villi in bowel. — Stock Photo
    Medical artwork showing intestinal villi in bowel.
    Realistic body model showing female anatomy on black background, computer illustration. — Stock Photo
    Realistic body model showing female anatomy on black background, computer illustration.
    Moraxella (Branhamella) catarrhalis bacteria, illustration. These are aerobic, gram-negative cocci (spherical bacteria) which are commonly found in the mucous membranes of the respiratory tract of mammals, including humans — Stock Photo
    Moraxella (Branhamella) catarrhalis bacteria, illustration. These are aerobic, gram-negative cocci (spherical bacteria) which are commonly found in the mucous membranes of the respiratory tract of mammals, including humans
    Lung cancer in female transparent body, conceptual computer illustration. — Stock Photo
    Lung cancer in female transparent body, conceptual computer illustration.
    3D rendering of liver and stomach of human digestive system — Stock Photo
    3D rendering of liver and stomach of human digestive system
    Anatomy of male urinary system — Stock Photo
    Anatomy of male urinary system
    Three dimensional medical illustration of male reproductive system with veins and arteries — Stock Photo
    Three dimensional medical illustration of male reproductive system with veins and arteries
    Lung cancer in female realistic body 3d model, conceptual computer illustration. — Stock Photo
    Lung cancer in female realistic body 3d model, conceptual computer illustration.
    Abstract illustration of Moraxella catarrhalis cocci bacteria. — Stock Photo
    Abstract illustration of Moraxella catarrhalis cocci bacteria.
    Intestinal villi, computer illustration — Stock Photo
    Intestinal villi, computer illustration
    Illustration of blue silhouette of obese woman with highlighted colon on black background. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted colon on black background.
    Medical illustration of bacteria in human intestine. — Stock Photo
    Medical illustration of bacteria in human intestine.
    Enterobius vermicularis threadworm eggs containing worm larvae, causative agent of enterobiasis, computer illustration. — Stock Photo
    Enterobius vermicularis threadworm eggs containing worm larvae, causative agent of enterobiasis, computer illustration.
    Diseased lungs in transparent female body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent female body on black background, computer illustration.