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    Digital illustration of human digestive system and close-up of intestinal bacteria. — Stock Photo
    Digital illustration of human digestive system and close-up of intestinal bacteria.
    Various normal bacteria in human intestine, digital illustration. — Stock Photo
    Various normal bacteria in human intestine, digital illustration.
    Scientist holding multi-well plate with growth medium. — Stock Photo
    Scientist holding multi-well plate with growth medium.
    Conceptual illustration of degeneration of dopaminergic neurons. — Stock Photo
    Conceptual illustration of degeneration of dopaminergic neurons.
    Digital illustration of nerve neurons cells. — Stock Photo
    Digital illustration of nerve neurons cells.
    Digital illustration of human digestive system and close-up of intestinal bacteria. — Stock Photo
    Digital illustration of human digestive system and close-up of intestinal bacteria.
    Structure of islet of langerhans, light micrograph. — Stock Photo
    Structure of islet of langerhans, light micrograph.
    Human egg cell surrounded by numerous spermatozoa, digital illustration of fertilization. — Stock Photo
    Human egg cell surrounded by numerous spermatozoa, digital illustration of fertilization.
    Various bacteria in human intestine, digital illustration. — Stock Photo
    Various bacteria in human intestine, digital illustration.
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Digital illustration of nerve neurons cells. — Stock Photo
    Digital illustration of nerve neurons cells.
    Digital illustration of human digestive system and close-up of intestinal bacteria. — Stock Photo
    Digital illustration of human digestive system and close-up of intestinal bacteria.
    Illustration of human kidney and light micrograph of section with glomerulus. — Stock Photo
    Illustration of human kidney and light micrograph of section with glomerulus.
    Conceptual illustration of degeneration of dopaminergic neurons. — Stock Photo
    Conceptual illustration of degeneration of dopaminergic neurons.
    Human egg cell surrounded by numerous spermatozoa, digital illustration of fertilization. — Stock Photo
    Human egg cell surrounded by numerous spermatozoa, digital illustration of fertilization.
    Digital illustration of nerve neurons cells. — Stock Photo
    Digital illustration of nerve neurons cells.
    Dopaminergic neuron brain cells, digital illustration. — Stock Photo
    Dopaminergic neuron brain cells, digital illustration.
    Molecular structure illustrating pure research. — Stock Photo
    Molecular structure illustrating pure research.
    Naegleria brain-eating amoeba forms, digital illustration — Stock Photo
    Naegleria brain-eating amoeba forms, digital illustration
    Naegleria brain-eating amoeba forms, digital illustration — Stock Photo
    Naegleria brain-eating amoeba forms, digital illustration
    Morphine binding to opioid receptors, digital illustration. — Stock Photo
    Morphine binding to opioid receptors, digital illustration.
    Medium tray with cells and DNA autoradiogram for scientific research. — Stock Photo
    Medium tray with cells and DNA autoradiogram for scientific research.
    Female researcher using light microscope for examining stem cells in culture jar. — Stock Photo
    Female researcher using light microscope for examining stem cells in culture jar.
    Female scientist holding multi-well plate with growth medium. — Stock Photo
    Female scientist holding multi-well plate with growth medium.
    Enkephalin binding to opioid receptor, digital illustration. — Stock Photo
    Enkephalin binding to opioid receptor, digital illustration.
    Closeup view of white and red grape sugar hearts in cells on white surface — Stock Photo
    Closeup view of white and red grape sugar hearts in cells on white surface
    Female researcher using light microscope for examining stem cells in culture jar. — Stock Photo
    Female researcher using light microscope for examining stem cells in culture jar.
    Medium tray with cells and DNA autoradiogram for scientific research. — Stock Photo
    Medium tray with cells and DNA autoradiogram for scientific research.
    Medium tray with cells and DNA autoradiogram for scientific research. — Stock Photo
    Medium tray with cells and DNA autoradiogram for scientific research.
    Closeup view of fruit, chocolate and vanilla pods — Stock Photo
    Closeup view of fruit, chocolate and vanilla pods
    Digital illustration of immunoglobulin in blood. — Stock Photo
    Digital illustration of immunoglobulin in blood.
    Male scientist using computer. — Stock Photo
    Male scientist using computer.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa. — Stock Photo
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa.
    Light micrograph of blood cells (mainly B cells, dark purple) in the liver of a patient with lymphocytic leukaemia. — Stock Photo
    Light micrograph of blood cells (mainly B cells, dark purple) in the liver of a patient with lymphocytic leukaemia.
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Narrowed blood vessel, computer illustration. — Stock Photo
    Narrowed blood vessel, computer illustration.
    Light micrograph of a section of stomach tissue showing a lesion (centre) caused by a gastric ulcer. — Stock Photo
    Light micrograph of a section of stomach tissue showing a lesion (centre) caused by a gastric ulcer.
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue.
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue. — Stock Photo
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue.
    Anatomy of the structure and layers of the stomach wall — Stock Photo
    Anatomy of the structure and layers of the stomach wall
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa. — Stock Photo
    Light micrograph (bottom left) and computer illustration (top right) of the lining of the stomach, known as the mucosa.
    Stylized colorful rabies virus particles — Stock Photo
    Stylized colorful rabies virus particles
    Illustration of HIV particles in blood. — Stock Photo
    Illustration of HIV particles in blood.
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Coloured scanning electron micrograph (SEM) of Komagataella phaffii - methylotrophic yeast. — Stock Photo
    Coloured scanning electron micrograph (SEM) of Komagataella phaffii - methylotrophic yeast.
    Fat (adipose) tissue, coloured scanning electron micrograph (SEM). — Stock Photo
    Fat (adipose) tissue, coloured scanning electron micrograph (SEM).
    Microscopic view of colorful tumor cells — Stock Photo
    Microscopic view of colorful tumor cells
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM). — Stock Photo
    Trachea (wind pipe) lining, coloured scanning electron micrograph (SEM).
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre. — Stock Photo
    Light micrograph of human red blood cells (erythrocytes), with two unidentified white blood cells (leucocytes) near the centre.
    Microscopic cross section view of HIV virus — Stock Photo
    Microscopic cross section view of HIV virus
    Papillae on the upper surface of a rose flower petal (Rosa sp), coloured scanning electron micrograph (SEM). — Stock Photo
    Papillae on the upper surface of a rose flower petal (Rosa sp), coloured scanning electron micrograph (SEM).
    Computer Illustration of a fat cell structure — Stock Photo
    Computer Illustration of a fat cell structure
    Leukaemia cells in a patient with Bloom's syndrome, coloured transmission electron micrograph (TEM). — Stock Photo
    Leukaemia cells in a patient with Bloom's syndrome, coloured transmission electron micrograph (TEM).
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem. — Stock Photo
    Light micrograph (LM) of a section through sunflower(helianthus annuus) tissue showing spiral tracheids, a type of xylem.
    Human hair with dandruff, coloured scanning electron micrograph (SEM). — Stock Photo
    Human hair with dandruff, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of a human red blood cell (erythrocyte, red) and a white blood cell (leucoocyte, blue). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a human red blood cell (erythrocyte, red) and a white blood cell (leucoocyte, blue).
    Conceptual image of coxsackievirus cells — Stock Photo
    Conceptual image of coxsackievirus cells
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla). — Stock Photo
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla).
    Layer of cells, light micrograph and computer illustration. — Stock Photo
    Layer of cells, light micrograph and computer illustration.