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    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a foetal vein filled with red blood cells (erythrocytes, red).
    Two fishermen fishing in the river on a sunny day — Stock Photo
    Two fishermen fishing in the river on a sunny day
    Man in a wetsuit drawing his kayak — Stock Photo
    Man in a wetsuit drawing his kayak
    Illustration of senior man silhouette with visible heart. — Stock Photo
    Illustration of senior man silhouette with visible heart.
    Nutty Granola in a bowl — Stock Photo
    Nutty Granola in a bowl
    Human heart with blood vessels and bronchial tree on white background. — Stock Photo
    Human heart with blood vessels and bronchial tree on white background.
    Ship sailing past iceberg on sunny Atlantic Ocean Greenland — Stock Photo
    Ship sailing past iceberg on sunny Atlantic Ocean Greenland
    Fresh figs in bowls on a wooden table — Stock Photo
    Fresh figs in bowls on a wooden table
    Digital illustration of senior man anatomy showing heart tumour. — Stock Photo
    Digital illustration of senior man anatomy showing heart tumour.
    Man standing next to an old boat, Mellieha, Malta — Stock Photo
    Man standing next to an old boat, Mellieha, Malta
    Veins in transparent dog body, anatomical computer illustration. — Stock Photo
    Veins in transparent dog body, anatomical computer illustration.
    Transparent body model showing male anatomy and internal organs, digital illustration. — Stock Photo
    Transparent body model showing male anatomy and internal organs, digital illustration.
    Colored carotid artery, medical doppler ultrasound scan. — Stock Photo
    Colored carotid artery, medical doppler ultrasound scan.
    Illustration of blue silhouette of obese woman with highlighted heart. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted heart.
    Rear view of man wearing straw hat transporting small group of people on a boat, rowing underneath natural rock arch, Bai Tu Long, Vietnam. — Stock Photo
    Rear view of man wearing straw hat transporting small group of people on a boat, rowing underneath natural rock arch, Bai Tu Long, Vietnam.
    Sailing boat on the ocean — Stock Photo
    Sailing boat on the ocean
    People wading into the ocean — Stock Photo
    People wading into the ocean
    Fat in blood cells blocking blood vessel, digital illustration. — Stock Photo
    Fat in blood cells blocking blood vessel, digital illustration.
    Digital illustration of abnormal white blood cells B-lymphocytes while hairy cell leukaemia. — Stock Photo
    Digital illustration of abnormal white blood cells B-lymphocytes while hairy cell leukaemia.
    Skeletal and cardiovascular systems — Stock Photo
    Skeletal and cardiovascular systems
    54795 — Stock Photo
    54795
    Light micrograph (LM) of a section through the fingertip. — Stock Photo
    Light micrograph (LM) of a section through the fingertip.
    Lake kasumigaura scenery in fujian province, high angle view — Stock Photo
    Lake kasumigaura scenery in fujian province, high angle view
    Female body with visible cardiovascular system, digital illustration — Stock Photo
    Female body with visible cardiovascular system, digital illustration
    Close-up shot of delicious Wild garlic oil in a glass bottle — Stock Photo
    Close-up shot of delicious Wild garlic oil in a glass bottle
    Female standing with eyes closed against boats moored on shore of canal in Copenhagen — Stock Photo
    Female standing with eyes closed against boats moored on shore of canal in Copenhagen
    Row of different boats at the shore in channel of old town, Porto, Portugal — Stock Photo
    Row of different boats at the shore in channel of old town, Porto, Portugal
    Rear view fisherman sitting in fishing boat — Stock Photo
    Rear view fisherman sitting in fishing boat
    Illustration of red blood cells affected by sickle cell anaemia with crescent-shaped cells. — Stock Photo
    Illustration of red blood cells affected by sickle cell anaemia with crescent-shaped cells.
    Human lymph node — Stock Photo
    Human lymph node
    3d illustration of cross-section of human eye with explanations and inscription. — Stock Photo
    3d illustration of cross-section of human eye with explanations and inscription.
    Realistic human heart and blood vessels on white background, digital illustration. — Stock Photo
    Realistic human heart and blood vessels on white background, digital illustration.
    Various fresh bread rolls in a wicker basket — Stock Photo
    Various fresh bread rolls in a wicker basket
    Anatomical male body showing skeleton and lymphatic system, digital illustration. — Stock Photo
    Anatomical male body showing skeleton and lymphatic system, digital illustration.
    Illustration of human heart anatomy on white background. — Stock Photo
    Illustration of human heart anatomy on white background.
    Conceptual man on a sailing boat — Stock Photo
    Conceptual man on a sailing boat
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration
    Man rowing a single scull boat — Stock Photo
    Man rowing a single scull boat
    Erythrocytes red blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes red blood cells in human blood vessel, digital illustration.
    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.
    Digital illustration of abnormal white blood cells B-lymphocytes while hairy cell leukaemia. — Stock Photo
    Digital illustration of abnormal white blood cells B-lymphocytes while hairy cell leukaemia.
    Medical illustration of fat inside of human artery. — Stock Photo
    Medical illustration of fat inside of human artery.
    Scenic view of sea and rock against cloudy sky — Stock Photo
    Scenic view of sea and rock against cloudy sky
    Anatomy of human skin — Stock Photo
    Anatomy of human skin
    Boats moored at Lebok reservoir at sunset, Sumbawa, West Nusa Tenggara, Indonesia — Stock Photo
    Boats moored at Lebok reservoir at sunset, Sumbawa, West Nusa Tenggara, Indonesia
    Male head and neck anatomy, digital illustration. — Stock Photo
    Male head and neck anatomy, digital illustration.
    Vascular system of neck in male body, computer illustration. — Stock Photo
    Vascular system of neck in male body, computer illustration.
    Basket with spinach in the hands on a concrete background — Stock Photo
    Basket with spinach in the hands on a concrete background
    Blue gondolas at night in Venice, Italy — Stock Photo
    Blue gondolas at night in Venice, Italy
    Aerial view to small vessel floating in blue ocean — Stock Photo
    Aerial view to small vessel floating in blue ocean
    Strawberry milkshake with whipped cream — Stock Photo
    Strawberry milkshake with whipped cream
    Cruise Ship; Caribbean — Stock Photo
    Cruise Ship; Caribbean
    A five year old boy smiling at the camera on a river boat on the Zambezi River. — Stock Photo
    A five year old boy smiling at the camera on a river boat on the Zambezi River.
    Scenic view of Aurora Boat in Fjord near Tromsa, Norway — Stock Photo
    Scenic view of Aurora Boat in Fjord near Tromsa, Norway
    Woman approaching sail boat on dingy in Raja Ampat — Stock Photo
    Woman approaching sail boat on dingy in Raja Ampat
    Lush rainforest along the coastline of the Great Bear Rainforest, Hartley Bay, British Columbia, Canada — Stock Photo
    Lush rainforest along the coastline of the Great Bear Rainforest, Hartley Bay, British Columbia, Canada
    Erythrocytes red blood cells in human blood vessel, digital illustration. — Stock Photo
    Erythrocytes red blood cells in human blood vessel, digital illustration.
    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.
    Blurred motion overhead view of rowing crew in sculling boat on water. — Stock Photo
    Blurred motion overhead view of rowing crew in sculling boat on water.
    Female anatomical body with visible lymphatic system, computer illustration. — Stock Photo
    Female anatomical body with visible lymphatic system, computer illustration.