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    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM). — Stock Photo
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM).
    Girl lying in bed and using smartphone — Stock Photo
    Girl lying in bed and using smartphone
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Portrait of girl with red hair talking over smartphone on railway countryside platform — Stock Photo
    Portrait of girl with red hair talking over smartphone on railway countryside platform
    Ginger woman with wavy hair making selfie — Stock Photo
    Ginger woman with wavy hair making selfie
    Portrait of brunette woman with red suitcase standing in sunlight and holding smartphone in hands — Stock Photo
    Portrait of brunette woman with red suitcase standing in sunlight and holding smartphone in hands
    Portrait of brunette woman with red suitcase leaning on parapet and using smartphone at railway station — Stock Photo
    Portrait of brunette woman with red suitcase leaning on parapet and using smartphone at railway station
    Mucosa of the trachea — Stock Photo
    Mucosa of the trachea
    Portrait of young girl with red hair talking over smartphone on railway countryside platform — Stock Photo
    Portrait of young girl with red hair talking over smartphone on railway countryside platform
    Stem cell research — Stock Photo
    Stem cell research
    Girl lying on bed on back with smartphone in hands — Stock Photo
    Girl lying on bed on back with smartphone in hands
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Girl lying on bed and using smartphone — Stock Photo
    Girl lying on bed and using smartphone
    Portrait of brunette woman with red suitcase leaning on parapet and using smartphone — Stock Photo
    Portrait of brunette woman with red suitcase leaning on parapet and using smartphone
    Girl sitting in bed and taking selfie — Stock Photo
    Girl sitting in bed and taking selfie
    Used surgical swab — Stock Photo
    Used surgical swab
    Girl lying on bed and using smartphone — Stock Photo
    Girl lying on bed and using smartphone
    Used surgical swab — Stock Photo
    Used surgical swab
    Pathological anatomy of Brain stoke — Stock Photo
    Pathological anatomy of Brain stoke
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Girl lying on bed under pillow and using smartphone — Stock Photo
    Girl lying on bed under pillow and using smartphone
    Girl lying on bed and using smartphone — Stock Photo
    Girl lying on bed and using smartphone
    Meiotic cell division — Stock Photo
    Meiotic cell division
    Pathological anatomy of atherosclerosis — Stock Photo
    Pathological anatomy of atherosclerosis
    Cut in an artery seen from its interior — Stock Photo
    Cut in an artery seen from its interior
    Red blood cells in the bloodstream — Stock Photo
    Red blood cells in the bloodstream
    Cancer cell morphology — Stock Photo
    Cancer cell morphology
    Red blood cells in an artery — Stock Photo
    Red blood cells in an artery
    Atherosclerosis harming blood vessel — Stock Photo
    Atherosclerosis harming blood vessel
    Activated platelets in blood vessel — Stock Photo
    Activated platelets in blood vessel
    Red blood cells in the bloodstream — Stock Photo
    Red blood cells in the bloodstream
    Christmas cactus pollen — Stock Photo
    Christmas cactus pollen
    Red blood cells in the bloodstream — Stock Photo
    Red blood cells in the bloodstream
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Daisy pollen grain — Stock Photo
    Daisy pollen grain
    Blood stream and artery walls — Stock Photo
    Blood stream and artery walls
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Cheerful girl on beach — Stock Photo
    Cheerful girl on beach
    Red blood cells — Stock Photo
    Red blood cells
    Cancer cell attacked by T cell — Stock Photo
    Cancer cell attacked by T cell
    Visual rendering of Sleeping sickness — Stock Photo
    Visual rendering of Sleeping sickness
    Cancer cell structure and shape — Stock Photo
    Cancer cell structure and shape
    Smiling woman taking self-portrait — Stock Photo
    Smiling woman taking self-portrait
    Activated platelets in blood vessel — Stock Photo
    Activated platelets in blood vessel
    Red and white blood cells — Stock Photo
    Red and white blood cells
    Normal blood cells in artery — Stock Photo
    Normal blood cells in artery
    Smiling woman taking self-portrait — Stock Photo
    Smiling woman taking self-portrait
    Cancer cell morphology — Stock Photo
    Cancer cell morphology
    Red blood cells — Stock Photo
    Red blood cells
    Molecules of insulin circulating in the blood stream — Stock Photo
    Molecules of insulin circulating in the blood stream
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Blood stream and artery walls — Stock Photo
    Blood stream and artery walls
    Visual rendering of Sleeping sickness — Stock Photo
    Visual rendering of Sleeping sickness
    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Red blood cells — Stock Photo
    Red blood cells
    Activated platelets in blood vessel — Stock Photo
    Activated platelets in blood vessel
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Normal red blood cells — Stock Photo
    Normal red blood cells