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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).
    Diseased lungs in transparent female body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent female body on black background, computer illustration.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Human lungs with pneumonia and close-up of bacteria and viruses. — Stock Photo
    Human lungs with pneumonia and close-up of bacteria and viruses.
    Illustration of lung cancer in human body silhouette. — Stock Photo
    Illustration of lung cancer in human body silhouette.
    Abstract male body with sore throat on blue background, conceptual digital illustration. — Stock Photo
    Abstract male body with sore throat on blue background, conceptual digital illustration.
    Illustration of transparent blue silhouette of male body with colored bronchi. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored bronchi.
    Illustration of female silhouette with painful larynx. — Stock Photo
    Illustration of female silhouette with painful larynx.
    Illustration of trachea with lungs on colored background — Stock Photo
    Illustration of trachea with lungs on colored background
    Transparent human silhouette with colored larynx, computer illustration. — Stock Photo
    Transparent human silhouette with colored larynx, computer illustration.
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Mid section illustration of bronchi in male body silhouette. — Stock Photo
    Mid section illustration of bronchi in male body silhouette.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Illustration of human silhouette with inflamed larynx. — Stock Photo
    Illustration of human silhouette with inflamed larynx.
    Horse anatomy and skeletal system, computer illustration. — Stock Photo
    Horse anatomy and skeletal system, computer illustration.
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Abstract transparent male body with glowing larynx cancer, digital illustration. — Stock Photo
    Abstract transparent male body with glowing larynx cancer, digital illustration.
    Horse anatomy and skeletal system, computer illustration. — Stock Photo
    Horse anatomy and skeletal system, computer illustration.
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    3d rendered illustration of lung cancer on white background. — Stock Photo
    3d rendered illustration of lung cancer on white background.
    Vascular system of healthy adult — Stock Photo
    Vascular system of healthy adult
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Illustration of silhouette of obese man with visible larynx. — Stock Photo
    Illustration of silhouette of obese man with visible larynx.
    3d rendered illustration of blue silhouette of man with inflamed lungs. — Stock Photo
    3d rendered illustration of blue silhouette of man with inflamed lungs.
    Diseased lungs in transparent male body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on black background, computer illustration.
    Colored lungs in transparent female body on black background, computer illustration. — Stock Photo
    Colored lungs in transparent female body on black background, computer illustration.
    Illustration of silhouette of obese man with visible lungs. — Stock Photo
    Illustration of silhouette of obese man with visible lungs.
    Colored lungs in transparent female body on black background, computer illustration. — Stock Photo
    Colored lungs in transparent female body on black background, computer illustration.
    3D rendering of human lungs on black background — Stock Photo
    3D rendering of human lungs on black background
    Diseased lungs in transparent male body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on black background, computer illustration.
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx.
    Close-up illustration of trachea in male body silhouette, close-up. — Stock Photo
    Close-up illustration of trachea in male body silhouette, close-up.
    Digital illustration of transparent elderly man body with visible orange-colored larynx. — Stock Photo
    Digital illustration of transparent elderly man body with visible orange-colored larynx.
    Orange colored lungs in male body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in male body silhouette, computer illustration.
    Anatomy of thyroid gland with larynx and cartilage — Stock Photo
    Anatomy of thyroid gland with larynx and cartilage
    Transparent male silhouette with colored lungs, computer illustration. — Stock Photo
    Transparent male silhouette with colored lungs, computer illustration.
    3d rendered illustration of lung and bronchi on white background. — Stock Photo
    3d rendered illustration of lung and bronchi on white background.
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    Respiratory system of adult — Stock Photo
    Respiratory system of adult
    Orange colored lungs in male body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in male body silhouette, computer illustration.
    Whooping cough bacterium (Bordetella pertussis), illustration. These rod-shaped Gram-negative bacilli cause whooping cough, known as pertussis, mainly in infants — Stock Photo
    Whooping cough bacterium (Bordetella pertussis), illustration. These rod-shaped Gram-negative bacilli cause whooping cough, known as pertussis, mainly in infants
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.
    Illustration of lung cancer in human body silhouette. — Stock Photo
    Illustration of lung cancer in human body silhouette.
    Diseased lungs in transparent male body on white background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on white background, computer illustration.
    Frontal illustration of blue silhouette of obese woman with highlighted larynx on black background. — Stock Photo
    Frontal illustration of blue silhouette of obese woman with highlighted larynx on black background.
    3d rendered illustration of blue silhouette of man with inflamed lungs on black background. — Stock Photo
    3d rendered illustration of blue silhouette of man with inflamed lungs on black background.
    Medical illustration of human lungs in body — Stock Photo
    Medical illustration of human lungs in body
    Diseased lungs in transparent male body on black background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on black background, computer illustration.
    Illustration of visible lungs in transparent human body silhouette. — Stock Photo
    Illustration of visible lungs in transparent human body silhouette.
    Yellow colored bronchi in body of woman, computer illustration. — Stock Photo
    Yellow colored bronchi in body of woman, computer illustration.
    Orange colored lungs in female body silhouette, computer illustration. — Stock Photo
    Orange colored lungs in female body silhouette, computer illustration.
    Illustration of senior woman blue silhouette with highlighted lungs on white background. — Stock Photo
    Illustration of senior woman blue silhouette with highlighted lungs on white background.
    Anatomy of dog lungs in transparent body, computer illustration. — Stock Photo
    Anatomy of dog lungs in transparent body, computer illustration.
    Illustration of senior woman blue silhouette with highlighted larynx on black background. — Stock Photo
    Illustration of senior woman blue silhouette with highlighted larynx on black background.
    Digital illustration of senior man anatomy showing lungs. — Stock Photo
    Digital illustration of senior man anatomy showing lungs.
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx on black background. — Stock Photo
    Low angle view illustration of blue silhouette of obese woman with highlighted larynx on black background.
    Horse anatomy and skeletal system, computer illustration. — Stock Photo
    Horse anatomy and skeletal system, computer 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
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.