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    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.
    Illustration of figure of obese man with visible lungs. — Stock Photo
    Illustration of figure of obese man with visible lungs.
    Illustration of blue silhouette of obese woman with highlighted colon. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted colon.
    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.
    Healthy intestinal villi — Stock Photo
    Healthy intestinal villi
    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.
    Realistic body model showing female anatomy on black background, computer illustration. — Stock Photo
    Realistic body model showing female anatomy on black background, computer illustration.
    Illustration of overweight woman with visible gallbladder on black background. — Stock Photo
    Illustration of overweight woman with visible gallbladder on black background.
    Computer illustration of yeast and hyphae stages of Candida fungi — Stock Photo
    Computer illustration of yeast and hyphae stages of Candida fungi
    Digital illustration of intestinal villi in digestive system. — Stock Photo
    Digital illustration of intestinal villi in digestive system.
    Pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual digital illustration. — Stock Photo
    Pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual digital illustration.
    Diseased gallbladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased gallbladder in abstract human body, conceptual digital illustration.
    Medical illustration of bacteria in human intestine. — Stock Photo
    Medical illustration of bacteria in human intestine.
    Lung cancer in female transparent body, conceptual computer illustration. — Stock Photo
    Lung cancer in female transparent body, conceptual computer illustration.
    Illustration of transparent blue silhouette of male body with colored colon. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored colon.
    3d anatomical model demonstrating female anatomy and internal organs in front view, computer illustration. — Stock Photo
    3d anatomical model demonstrating female anatomy and internal organs in front view, computer illustration.
    Diseased bladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased bladder in abstract human body, conceptual digital illustration.
    Diseased bladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased bladder in abstract human body, conceptual digital illustration.
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Digital illustration of senior man anatomy showing lung tumour. — Stock Photo
    Digital illustration of senior man anatomy showing lung tumour.
    3d rendered illustration of colored female bronchi in body silhouette. — Stock Photo
    3d rendered illustration of colored female bronchi in body silhouette.
    3d rendered illustration of colored female colon in body silhouette. — Stock Photo
    3d rendered illustration of colored female colon in body silhouette.
    Illustration of silhouette of obese man with visible lungs. — Stock Photo
    Illustration of silhouette of obese man with visible lungs.
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Illustration of silhouette of obese man with visible lungs. — Stock Photo
    Illustration of silhouette of obese man with visible lungs.
    Female anatomy with orange colored large intestine, digital illustration. — Stock Photo
    Female anatomy with orange colored large intestine, digital illustration.
    Medical artwork showing intestinal villi in bowel. — Stock Photo
    Medical artwork showing intestinal villi in bowel.
    Female anatomical model with pink colored and visible lungs, computer illustration. — Stock Photo
    Female anatomical model with pink colored and visible lungs, computer illustration.
    Parasitic nematode worm — Stock Photo
    Parasitic nematode worm
    Illustration of visible colored lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible colored lungs in transparent human body silhouette.
    Transparent male silhouette with visible bronchi, computer illustration. — Stock Photo
    Transparent male silhouette with visible bronchi, computer illustration.
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.
    Digestive system of healthy adult — Stock Photo
    Digestive system of healthy adult
    Orange colored lungs in male body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in male body silhouette, computer illustration.
    Illustration of female silhouette with highlighted rectum. — Stock Photo
    Illustration of female silhouette with highlighted rectum.
    Colon lining and mucous producing cells — Stock Photo
    Colon lining and mucous producing cells
    Female anatomical model with orange colored and visible lungs, computer illustration. — Stock Photo
    Female anatomical model with orange colored and visible lungs, 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.
    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.
    Railway line and polder or re-claimed lands, North Holland, Netherlands — Stock Photo
    Railway line and polder or re-claimed lands, North Holland, Netherlands
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Illustration of human heart and lungs on white background. — Stock Photo
    Illustration of human heart and lungs on white background.
    Human digestive system microbiota, 3d illustration. — Stock Photo
    Human digestive system microbiota, 3d illustration.
    Illustration of silhouette of obese man with visible colon. — Stock Photo
    Illustration of silhouette of obese man with visible colon.
    Digital illustration of transparent elderly man body with visible orange-colored kidneys. — Stock Photo
    Digital illustration of transparent elderly man body with visible orange-colored kidneys.
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, 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.
    Human intestinal villi, computer illustration. — Stock Photo
    Human intestinal villi, computer illustration.
    Female anatomical model with yellow colored and visible lungs, computer illustration. — Stock Photo
    Female anatomical model with yellow colored and visible lungs, computer illustration.
    Adenovirus structure, 3d digital illustration. — Stock Photo
    Adenovirus structure, 3d digital illustration.
    Pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual digital illustration. — Stock Photo
    Pneumonia caused by Mycoplasma pneumoniae bacteria, conceptual digital illustration.
    Illustration of senior woman blue silhouette with highlighted colon on black background. — Stock Photo
    Illustration of senior woman blue silhouette with highlighted colon on black background.
    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.
    Medical illustration of inflamed intestinal villi. — Stock Photo
    Medical illustration of inflamed intestinal villi.
    Pneumonia caused by bacteria Moraxella catarrhalis, digital illustration. — Stock Photo
    Pneumonia caused by bacteria Moraxella catarrhalis, digital illustration.
    Digital illustration of anaerobic saccharolytic Bacteroides bacteria. — Stock Photo
    Digital illustration of anaerobic saccharolytic Bacteroides bacteria.
    Illustration of female silhouette with highlighted lung infection. — Stock Photo
    Illustration of female silhouette with highlighted lung infection.
    Illustration of transparent blue silhouette of male body with colored bronchi. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored bronchi.
    Human Colon, computer illustration — Stock Photo
    Human Colon, computer illustration