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    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Cardiovascular system transporting nutrients and oxygen — Stock Photo
    Cardiovascular system transporting nutrients and oxygen
    Cardiovascular system of healthy adult — Stock Photo
    Cardiovascular system of healthy adult
    3d rendered illustration of human vascular system. — Stock Photo
    3d rendered illustration of human vascular system.
    Digital illustration of balls of cholesterol lipids in blood vessel. — Stock Photo
    Digital illustration of balls of cholesterol lipids in blood vessel.
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    T lymphocyte (orange) attached to a cancer cell (blue), illustration. T lymphocytes are a type of white blood cell which matures in the thymus — Stock Photo
    T lymphocyte (orange) attached to a cancer cell (blue), illustration. T lymphocytes are a type of white blood cell which matures in the thymus
    Vascular system of healthy adult — Stock Photo
    Vascular system of healthy adult
    Red blood cells — Stock Photo
    Red blood cells
    Normal White blood cell — Stock Photo
    Normal White blood cell
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system. — Stock Photo
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system.
    Illustration of eosinophil white blood cell with purple lobed nuclei. — Stock Photo
    Illustration of eosinophil white blood cell with purple lobed nuclei.
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia. — Stock Photo
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia.
    Human cardiovascular system — Stock Photo
    Human cardiovascular system
    Cardiovascular system showing veins and arteries — Stock Photo
    Cardiovascular system showing veins and arteries
    White blood cells, digital illustration. — Stock Photo
    White blood cells, digital illustration.
    Coloured angiogram (blood vessel X-ray) of the coronary arteries of a 52 year old patient. The artery at right has had a stent placed in it to treat a blockage. — Stock Photo
    Coloured angiogram (blood vessel X-ray) of the coronary arteries of a 52 year old patient. The artery at right has had a stent placed in it to treat a blockage.
    Cardiovascular system in female body, digital illustration. — Stock Photo
    Cardiovascular system in female body, digital illustration.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left). — Stock Photo
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left).
    Active senior man donating blood in blood bank — Stock Photo
    Active senior man donating blood in blood bank
    Male anatomy showing vascular system, computer illustration. — Stock Photo
    Male anatomy showing vascular system, computer illustration.
    Human heart model on blue background, computer illustration. — Stock Photo
    Human heart model on blue background, computer illustration.
    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.
    Abstract blood vessel with white and red blood cells, digital illustration. — Stock Photo
    Abstract blood vessel with white and red blood cells, digital illustration.
    Female anatomy showing vascular system, digital illustration. — Stock Photo
    Female anatomy showing vascular system, digital illustration.
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells — Stock Photo
    Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells
    Human brain haemorrhage, digital illustration. — Stock Photo
    Human brain haemorrhage, digital illustration.
    Digital illustration of immunoglobulin in blood. — Stock Photo
    Digital illustration of immunoglobulin in blood.
    Female silhouette showing heart anatomy, computer illustration. — Stock Photo
    Female silhouette showing heart anatomy, computer illustration.
    Human body model showing female anatomy and nervous system, digital 3d render illustration. — Stock Photo
    Human body model showing female anatomy and nervous system, digital 3d render illustration.
    Veins in transparent dog body, anatomical computer illustration. — Stock Photo
    Veins in transparent dog body, anatomical computer illustration.
    Dendritic cell on plain background, digital illustration. — Stock Photo
    Dendritic cell on plain background, digital illustration.
    White blood cells, digital illustration. — Stock Photo
    White blood cells, digital illustration.
    Illustration of transparent blue silhouette of male body with colored heart tumour. — Stock Photo
    Illustration of transparent blue silhouette of male body with colored heart tumour.
    Dendritic cell, computer illustration. A dendritic cell is a type of white blood cell. It is an antigen-presenting cell (APC), which presents antigens to T lymphocytes. — Stock Photo
    Dendritic cell, computer illustration. A dendritic cell is a type of white blood cell. It is an antigen-presenting cell (APC), which presents antigens to T lymphocytes.
    Healthy red blood cells — Stock Photo
    Healthy red blood cells
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration. — Stock Photo
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration.
    Arteries in transparent dog body, anatomical computer illustration. — Stock Photo
    Arteries in transparent dog body, anatomical computer illustration.
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Structure of dog vascular system with colorful blood vessels in transparent body, cropped, computer illustration. — Stock Photo
    Structure of dog vascular system with colorful blood vessels in transparent body, cropped, computer illustration.
    Female cardiovascular system on white background. — Stock Photo
    Female cardiovascular system on white background.
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes and leukocytes blood cells in human blood vessel, digital illustration.
    3d anatomical model demonstrating female anatomy and internal organs in obese body in front view, computer illustration. — Stock Photo
    3d anatomical model demonstrating female anatomy and internal organs in obese body in front view, computer illustration.
    Male back anatomy and skeletal system, computer illustration. — Stock Photo
    Male back anatomy and skeletal system, computer illustration.
    Physician checking senior man donating blood in blood bank — Stock Photo
    Physician checking senior man donating blood in blood bank
    3d rendered illustration of vascular system of human head. — Stock Photo
    3d rendered illustration of vascular system of human head.
    Male body silhouette showing heart anatomy, computer illustration. — Stock Photo
    Male body silhouette showing heart anatomy, computer illustration.
    Transparent female body silhouette with yellow colored spleen, digital illustration. — Stock Photo
    Transparent female body silhouette with yellow colored spleen, digital illustration.
    Brain anatomy showing blood supply system — Stock Photo
    Brain anatomy showing blood supply system
    Male upper body anatomy and blood vessels, computer illustration. — Stock Photo
    Male upper body anatomy and blood vessels, computer illustration.
    White blood cell structure — Stock Photo
    White blood cell structure