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    Plasma cell, computer illustration. Plasma cells, which are found in the blood and lymph, are mature B lymphocytes (white blood cells) that produce and secrete antibodies during an immune response. — Stock Photo
    Plasma cell, computer illustration. Plasma cells, which are found in the blood and lymph, are mature B lymphocytes (white blood cells) that produce and secrete antibodies during an immune response.
    3d rendering of a virus — Stock Photo
    3d rendering of a virus
    Nurse tigthing a blood pressure meters to a patient female — Stock Photo
    Nurse tigthing a blood pressure meters to a patient female
    Headache, computer illustration. A male body, with skeleton, holding its head in pain. The red area in the skull represents the pain of a headache — Stock Photo
    Headache, computer illustration. A male body, with skeleton, holding its head in pain. The red area in the skull represents the pain of a headache
    Illustration of red and white blood cells in the bloodstream. — Stock Photo
    Illustration of red and white blood cells in the bloodstream.
    Cropped shot of nurse touching blood transfusion pipes — Stock Photo
    Cropped shot of nurse touching blood transfusion pipes
    Light micrograph of hepatic hemosiderosis. Hemosiderosis is a form of iron overload disorder resulting in the accumulation of hemosiderin. Haematoxylin and eosin stain. — Stock Photo
    Light micrograph of hepatic hemosiderosis. Hemosiderosis is a form of iron overload disorder resulting in the accumulation of hemosiderin. Haematoxylin and eosin stain.
    Headache, computer illustration. A male body, with skeleton, holding its head in pain. The red area in the skull represents the pain of a headache — Stock Photo
    Headache, computer illustration. A male body, with skeleton, holding its head in pain. The red area in the skull represents the pain of a headache
    B cells and antibodies, computer illustration. — Stock Photo
    B cells and antibodies, computer illustration.
    Neutrophil cells. Coloured transmission electron micrograph (TEM) of human neutrophil cells. Neutrophils are involved in inflammatory responses to tissue damage, where they engulf and destroy microorganisms — Stock Photo
    Neutrophil cells. Coloured transmission electron micrograph (TEM) of human neutrophil cells. Neutrophils are involved in inflammatory responses to tissue damage, where they engulf and destroy microorganisms
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system — Stock Photo
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system
    Human compact bone tissue, light micrograph. Haematoxylin and eosin stain. — Stock Photo
    Human compact bone tissue, light micrograph. Haematoxylin and eosin stain.
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system — Stock Photo
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system
    Cancer cells, computer illustration — Stock Photo
    Cancer cells, computer 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
    Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food — Stock Photo
    Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food
    Human bone marrow, light micrograph. Haematoxylin and eosin stain. — Stock Photo
    Human bone marrow, light micrograph. Haematoxylin and eosin stain.
    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
    Illustration of lymphocytosis, showing abundant white blood cells inside blood vessel. — Stock Photo
    Illustration of lymphocytosis, showing abundant white blood cells inside blood vessel.
    Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food — Stock Photo
    Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food
    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    A woman slicing blood oranges — Stock Photo
    A woman slicing blood oranges
    Conceptual human lungs with coffee beans — Stock Photo
    Conceptual human lungs with coffee beans
    Conceptual illustration of red blood cells (erythrocytes) with oxygen molecules (white) in an artery. — Stock Photo
    Conceptual illustration of red blood cells (erythrocytes) with oxygen molecules (white) in an artery.
    Red blood cells (erythrocytes) in a blood vessel, illustration. — Stock Photo
    Red blood cells (erythrocytes) in a blood vessel, illustration.
    Woman checking her insulin levels before eating a cake — Stock Photo
    Woman checking her insulin levels before eating a cake
    Venule. Coloured transmission electron micrograph (TEM). Venules are small veins that transport deoxygenated blood from the capillary beds to the veins. Endothelial cells line the entire circulatory system — Stock Photo
    Venule. Coloured transmission electron micrograph (TEM). Venules are small veins that transport deoxygenated blood from the capillary beds to the veins. Endothelial cells line the entire circulatory system
    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    Blood cells, light micrograph. — Stock Photo
    Blood cells, light micrograph.
    Blood cells, light micrograph. — Stock Photo
    Blood cells, light micrograph.
    Cross-section of the human eye, 3d illustration. — Stock Photo
    Cross-section of the human eye, 3d illustration.
    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    Human blood, computer illustration — Stock Photo
    Human blood, computer illustration
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation. — Stock Photo
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation.
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines). — Stock Photo
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines).
    Human blood, computer illustration — Stock Photo
    Human blood, computer illustration
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation. — Stock Photo
    Human heart and its electrical system, 3d illustration. The yellow lines demonstrate the electrical (conduction) system of the heart. The heart at right shows an irregular heartbeat (arrhythmia) and atrial fibrillation.
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines). — Stock Photo
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines).
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Blood vessels of the head, computer illustration — Stock Photo
    Blood vessels of the head, computer illustration
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Blood vessels of the knee, computer illustration — Stock Photo
    Blood vessels of the knee, computer illustration
    Blood vessels of the head, computer illustration — Stock Photo
    Blood vessels of the head, computer illustration
    Human bronchi and heart, illustration — Stock Photo
    Human bronchi and heart, illustration
    Blood vessels of foot, computer illustration — Stock Photo
    Blood vessels of foot, computer illustration
    Blood vessels of the knee, computer illustration — Stock Photo
    Blood vessels of the knee, computer illustration
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration
    Blood vessels of the head, computer illustration — Stock Photo
    Blood vessels of the head, computer illustration
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration
    Blood vessels of the knee, computer illustration — Stock Photo
    Blood vessels of the knee, computer illustration
    Human Platelets, computer illustration — Stock Photo
    Human Platelets, computer illustration
    Blood vessels of foot, computer illustration — Stock Photo
    Blood vessels of foot, computer illustration
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration
    Blood vessels of the head, computer illustration — Stock Photo
    Blood vessels of the head, computer illustration
    Blood vessels of foot, computer illustration — Stock Photo
    Blood vessels of foot, computer illustration
    Blood vessels of foot, computer illustration — Stock Photo
    Blood vessels of foot, computer illustration
    Blood vessels of foot, computer illustration — Stock Photo
    Blood vessels of foot, computer illustration
    Healthy female vascular system, computer illustration — Stock Photo
    Healthy female vascular system, computer illustration