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    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the — Stock Photo
    Illustration of platelets (thrombocytes) that have been activated (with extensions) and those that are non-activated. Platelets are part of the blood. When a blood vessel is damaged, the platelets become activated and secrete chemicals that cause the
    Silhouette of a fisherman checking his nets at sunrise, Vietnam — Stock Photo
    Silhouette of a fisherman checking his nets at sunrise, Vietnam
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Boat in front of Nevis Range, Scotland, UK — Stock Photo
    Boat in front of Nevis Range, Scotland, UK
    Bay yacht club — Stock Photo
    Bay yacht club
    Illustration of cross section of human skin with hair follicles and blood vessels. — Stock Photo
    Illustration of cross section of human skin with hair follicles and blood vessels.
    Platelets in blood vessel — Stock Photo
    Platelets in blood vessel
    Aerial view of Golden Gate Bridge and landscape in San Francisco Bay and Bay area, USA. — Stock Photo
    Aerial view of Golden Gate Bridge and landscape in San Francisco Bay and Bay area, USA.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Los Cabos landscape — Stock Photo
    Los Cabos landscape
    Crop legs of male lying on side deck of expensive boat floating on waving sea in sunny day — Stock Photo
    Crop legs of male lying on side deck of expensive boat floating on waving sea in sunny day
    Healthy red blood cells — Stock Photo
    Healthy red blood cells
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Traditional boats on sandy shore near Da Nang, Vietnam. — Stock Photo
    Traditional boats on sandy shore near Da Nang, Vietnam.
    Anatomy of heart interior with labels — Stock Photo
    Anatomy of heart interior with labels
    Mature man standing on sailboat and looking at view on lake. — Stock Photo
    Mature man standing on sailboat and looking at view on lake.
    Unrecognizable men with guns and in protective helmets playing paintball among abandoned car — Stock Photo
    Unrecognizable men with guns and in protective helmets playing paintball among abandoned car
    Male body silhouette showing heart anatomy, computer illustration. — Stock Photo
    Male body silhouette showing heart anatomy, computer illustration.
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Upper-body anatomy of adult male — Stock Photo
    Upper-body anatomy of adult male
    Overhead view of a crew rowing in an octuple racing shell boat, rowers, motion blur. — Stock Photo
    Overhead view of a crew rowing in an octuple racing shell boat, rowers, motion blur.
    Chocolate pudding on the table — Stock Photo
    Chocolate pudding on the table
    Aerial view of harbour, Alesund, More og Romsdal, Norway — Stock Photo
    Aerial view of harbour, Alesund, More og Romsdal, Norway
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs. — Stock Photo
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs.
    Tokyo city skyline lit up at night, Tokyo, Japan — Stock Photo
    Tokyo city skyline lit up at night, Tokyo, Japan
    Close-up shot of delicious Mushrooms - girolles, ceps, morels — Stock Photo
    Close-up shot of delicious Mushrooms - girolles, ceps, morels
    Welder repairing vessel part in workshop — Stock Photo
    Welder repairing vessel part in workshop
    Digital illustration of trypanosomes in red blood cells in blood causing sleeping sickness. — Stock Photo
    Digital illustration of trypanosomes in red blood cells in blood causing sleeping sickness.
    Two fishermen preparing for fishing at countryside on a sunny day — Stock Photo
    Two fishermen preparing for fishing at countryside on a sunny day
    Female upper body lymphatic system, computer illustration. — Stock Photo
    Female upper body lymphatic system, computer illustration.
    Female crew racers rowing — Stock Photo
    Female crew racers rowing
    Two colourful, wooden rowboats on the beach in the seaside resort town of Nazare; Nazare, Leiria District, Portugal — Stock Photo
    Two colourful, wooden rowboats on the beach in the seaside resort town of Nazare; Nazare, Leiria District, Portugal
    Single scull rowing boat — Stock Photo
    Single scull rowing boat
    Several empty wooden boats with lifebuoys on lake shore in sunny weather — Stock Photo
    Several empty wooden boats with lifebuoys on lake shore in sunny weather
    Illustration of aortic aneurysm in human heart. — Stock Photo
    Illustration of aortic aneurysm in human heart.
    Illustration of male office worker vascular system. — Stock Photo
    Illustration of male office worker vascular system.
    Human heart with colored superior vena cava, computer illustration. — Stock Photo
    Human heart with colored superior vena cava, computer illustration.
    Coronary veins, computer illustration. — Stock Photo
    Coronary veins, computer illustration.
    Girl In A Kayak on water surface — Stock Photo
    Girl In A Kayak on water surface
    Man in a sea kayak — Stock Photo
    Man in a sea kayak
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    LAOS, 4000 ISLANDS AREA: From above shot of boy with wet face looking at camera — Stock Photo
    LAOS, 4000 ISLANDS AREA: From above shot of boy with wet face looking at camera
    Illustration of platelets fixing wound with erythrocytes blood flow. — Stock Photo
    Illustration of platelets fixing wound with erythrocytes blood flow.
    Heart disease in male body, conceptual computer illustration. — Stock Photo
    Heart disease in male body, conceptual computer illustration.
    The Pier at sunset, Cairns, Queensland, Australia — Stock Photo
    The Pier at sunset, Cairns, Queensland, Australia
    Illustration of human heart and lung on white background. — Stock Photo
    Illustration of human heart and lung on white background.
    Venice gondolas with Church of San Giorgio maggiore in background, Venice, Italy — Stock Photo
    Venice gondolas with Church of San Giorgio maggiore in background, Venice, Italy
    Crane of cargo ship with pulp, Howe Sound, British Columbia, Canada. — Stock Photo
    Crane of cargo ship with pulp, Howe Sound, British Columbia, Canada.
    Illustration of figure of obese man with visible heart. — Stock Photo
    Illustration of figure of obese man with visible heart.
    Female abdominal anatomy and internal organs, computer illustration. — Stock Photo
    Female abdominal anatomy and internal organs, computer illustration.
    Deck of cruise boat with empty white chairs in row under clear sky with clouds — Stock Photo
    Deck of cruise boat with empty white chairs in row under clear sky with clouds
    Two fishermen preparing for fishing at countryside on a sunny day — Stock Photo
    Two fishermen preparing for fishing at countryside on a sunny day
    Blue deck aboard ship with metal door and blue sky — Stock Photo
    Blue deck aboard ship with metal door and blue sky
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Row of aged wooden boats moored on sandy beach of ocean against green tropical plants on So Tom and Prncipe island in sunny day — Stock Photo
    Row of aged wooden boats moored on sandy beach of ocean against green tropical plants on So Tom and Prncipe island in sunny day
    Realistic skeleton model showing female anatomy on white background, computer illustration. — Stock Photo
    Realistic skeleton model showing female anatomy on white background, computer illustration.
    Sea port with white yachts and boats in city with buildings on hills at beautiful sunset with cloudy sky — Stock Photo
    Sea port with white yachts and boats in city with buildings on hills at beautiful sunset with cloudy sky
    Italy, Venice, Early morning view from Rialto Bridge — Stock Photo
    Italy, Venice, Early morning view from Rialto Bridge
    Silhouette of a fisherman checking his nets at sunrise, Vietnam — Stock Photo
    Silhouette of a fisherman checking his nets at sunrise, Vietnam