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    Digital three dimensional illustration of human lungs. — Stock Photo
    Digital three dimensional illustration of human lungs.
    Activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Activated blood cell fragments platelets, coloured scanning electron micrograph.
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample. — Stock Photo
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample.
    Neutrophil white blood cells, digital illustration. — Stock Photo
    Neutrophil white blood cells, digital illustration.
    Non-activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Non-activated blood cell fragments platelets, coloured scanning electron micrograph.
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Activated blood cell fragments platelets, coloured scanning electron micrograph.
    Blood in human urine in sample pots, studio shot. — Stock Photo
    Blood in human urine in sample pots, studio shot.
    Digital three dimensional illustration of human lungs. — Stock Photo
    Digital three dimensional illustration of human lungs.
    Activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Activated blood cell fragments platelets, coloured scanning electron micrograph.
    Blood in human urine in sample pots, studio shot. — Stock Photo
    Blood in human urine in sample pots, studio shot.
    Digital three dimensional illustration of human lungs. — Stock Photo
    Digital three dimensional illustration of human lungs.
    Digital illustration of human body with external haemorrhoids. — Stock Photo
    Digital illustration of human body with external haemorrhoids.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing. — Stock Photo
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Digital illustration of human body with external haemorrhoids. — Stock Photo
    Digital illustration of human body with external haemorrhoids.
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing. — Stock Photo
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing.
    Glass slide containing human sample under light microscope for medical testing. — Stock Photo
    Glass slide containing human sample under light microscope for medical testing.
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Monocyte white blood cell, digital illustration. — Stock Photo
    Monocyte white blood cell, digital illustration.
    Eosinophil white blood cell, digital illustration. — Stock Photo
    Eosinophil white blood cell, digital illustration.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Veterinarian examining cat in veterinary surgery — Stock Photo
    Veterinarian examining cat in veterinary surgery
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Digital illustration of human leg affected by lymphatic filariasis and close-up of microfilaria worm parasite. — Stock Photo
    Digital illustration of human leg affected by lymphatic filariasis and close-up of microfilaria worm parasite.
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing. — Stock Photo
    Close-up of hands of scientist placing slide with human sample under light microscope for medical testing.
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Lymphocyte white blood cell, digital illustration. — Stock Photo
    Lymphocyte white blood cell, digital illustration.
    Neutrophil white blood cell, digital illustration. — Stock Photo
    Neutrophil white blood cell, digital illustration.
    Erythrocyte red blood cell, digital illustration. — Stock Photo
    Erythrocyte red blood cell, digital illustration.
    Basophil white blood cell, digital illustration. — Stock Photo
    Basophil white blood cell, digital illustration.
    Bag containing donated human blood, placenta and umbilical cord. — Stock Photo
    Bag containing donated human blood, placenta and umbilical cord.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Human heart against yellow background, illustration. — Stock Photo
    Human heart against yellow background, illustration.
    Human heart against red background, illustration. — Stock Photo
    Human heart against red background, illustration.
    Human heart against blue background, illustration. — Stock Photo
    Human heart against blue background, illustration.
    Human heart against blue background, illustration. — Stock Photo
    Human heart against blue background, illustration.
    Human heart against red background, illustration. — Stock Photo
    Human heart against red background, illustration.
    Human chorionic gonadotropin glycoprotein hormone, molecular structure. — Stock Photo
    Human chorionic gonadotropin glycoprotein hormone, molecular structure.
    Close-up of blood sample in tube and syringe. — Stock Photo
    Close-up of blood sample in tube and syringe.
    Human chorionic gonadotropin glycoprotein hormone, molecular structure. — Stock Photo
    Human chorionic gonadotropin glycoprotein hormone, molecular structure.
    Close-up of blood sample in tube and syringe. — Stock Photo
    Close-up of blood sample in tube and syringe.
    Colored X-ray showing blood vessels in lung. — Stock Photo
    Colored X-ray showing blood vessels in lung.
    Close-up of blood sample in tube and syringe. — Stock Photo
    Close-up of blood sample in tube and syringe.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Light micrograph of a longitudinal section through a healthy arteriole. — Stock Photo
    Light micrograph of a longitudinal section through a healthy arteriole.
    Narrowed blood vessel, computer illustration. — Stock Photo
    Narrowed blood vessel, computer illustration.
    Human upper body with bones, muscles and circulatory system — Stock Photo
    Human upper body with bones, muscles and circulatory system
    Illustration of HIV particles in blood. — Stock Photo
    Illustration of HIV particles in blood.
    Medical illustration of pulmonary embolism — Stock Photo
    Medical illustration of pulmonary embolism
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre. — Stock Photo
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre.
    Medical illustration of arteries, veins and lymphatic system in human legs — Stock Photo
    Medical illustration of arteries, veins and lymphatic system in human legs