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    Old church in English countryside — Stock Photo
    Old church in English countryside
    Coloured magnetic resonance angiogram (MRA) of the arteries (white) supplying the kidneys (blue, upper left and right). — Stock Photo
    Coloured magnetic resonance angiogram (MRA) of the arteries (white) supplying the kidneys (blue, upper left and right).
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Young vain man in stylish wear with hat standing on tiled wall looking away — Stock Photo
    Young vain man in stylish wear with hat standing on tiled wall looking away
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Young vain man in stylish wear with long nails standing on tiled wall with eyes closed — Stock Photo
    Young vain man in stylish wear with long nails standing on tiled wall with eyes closed
    Coloured scanning electron micrograph intricately structured microscopic brochosomes granules secreted by leafhopper. — Stock Photo
    Coloured scanning electron micrograph intricately structured microscopic brochosomes granules secreted by leafhopper.
    House dust mites — Stock Photo
    House dust mites
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Old church in English countryside — Stock Photo
    Old church in English countryside
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Coloured X-ray of arthritic knees — Stock Photo
    Coloured X-ray of arthritic knees
    Intestinal microvilli. Coloured scanning electron micrograph (SEM) of microvilli from the small intestine. These tiny structures form a dense brush-like covering on the absorptive surfaces of the cells lining the small intestine — Stock Photo
    Intestinal microvilli. Coloured scanning electron micrograph (SEM) of microvilli from the small intestine. These tiny structures form a dense brush-like covering on the absorptive surfaces of the cells lining the small intestine
    Human silhouette with Pneumocystis pneumonia and close-up of fungus spores. — Stock Photo
    Human silhouette with Pneumocystis pneumonia and close-up of fungus spores.
    Digital illustration of pollen grains on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grains on anther of Chinese hibiscus flower.
    Colored scanning electron micrograph of rod-shaped Gram-negative bacteria Escherichia coli. — Stock Photo
    Colored scanning electron micrograph of rod-shaped Gram-negative bacteria Escherichia coli.
    Gram negative Calymmatobacterium sp. — Stock Photo
    Gram negative Calymmatobacterium sp.
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum — Stock Photo
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum
    False hellebore close-up view, black and white image — Stock Photo
    False hellebore close-up view, black and white image
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is blue. Mitochondria (cyan)) in the cell's cytoplasm produce energy for the cell. Lysosomes (red) contain enzymes for digesting foreign particles. M
    Campylobacter jejuni bacteria with flagella, digital artwork. — Stock Photo
    Campylobacter jejuni bacteria with flagella, digital artwork.
    Leg in stiletto shoe, coloured MRI style X-ray. — Stock Photo
    Leg in stiletto shoe, coloured MRI style X-ray.
    Poppy (Papaver orientalis), coloured X-ray — Stock Photo
    Poppy (Papaver orientalis), coloured X-ray
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes. — Stock Photo
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes.
    Pair of robust ghost pipefish — Stock Photo
    Pair of robust ghost pipefish
    Horse chestnut pollen grain — Stock Photo
    Horse chestnut pollen grain
    Fat cells and supportive connective tissue — Stock Photo
    Fat cells and supportive connective tissue
    Dividing prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Dividing prostate cancer cells, coloured scanning electron micrograph.
    Man holding just caught yellowfin fish. panama — Stock Photo
    Man holding just caught yellowfin fish. panama
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum. — Stock Photo
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum.
    Digital illustration of pollen grains on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grains on anther of Chinese hibiscus flower.
    Coloured scanning electron micrograph of cancer cells from colon. — Stock Photo
    Coloured scanning electron micrograph of cancer cells from colon.
    African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory — Stock Photo
    African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Coloured scanning electron micrograph of bacteria cultured from mobile phone. — Stock Photo
    Coloured scanning electron micrograph of bacteria cultured from mobile phone.
    Zika virus particles — Stock Photo
    Zika virus particles
    Digital illustration of pollen grains on anther of Chinese hibiscus flower. — Stock Photo
    Digital illustration of pollen grains on anther of Chinese hibiscus flower.
    Stick insect foot — Stock Photo
    Stick insect foot
    Poppy (Papaver orientalis), coloured X-ray — Stock Photo
    Poppy (Papaver orientalis), coloured X-ray
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (green) — Stock Photo
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (green)
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Young vain man in stylish wear with hat standing on tiled wall looking away — Stock Photo
    Young vain man in stylish wear with hat standing on tiled wall looking away
    Human hair, coloured scanning electron micrograph (SEM). Magnification: x550 when printed at 10 centimetres wide. — Stock Photo
    Human hair, coloured scanning electron micrograph (SEM). Magnification: x550 when printed at 10 centimetres wide.
    Coloured profile X-ray of a human mandible (lower jaw). — Stock Photo
    Coloured profile X-ray of a human mandible (lower jaw).
    Scale insects. Coloured scanning electron micrograph (SEM) of scale insects (superfamily Coccoidea) on a leaf. This pest feeds on the plant's sap. It secretes a powdery wax coating that protects it against pesticides and predators — Stock Photo
    Scale insects. Coloured scanning electron micrograph (SEM) of scale insects (superfamily Coccoidea) on a leaf. This pest feeds on the plant's sap. It secretes a powdery wax coating that protects it against pesticides and predators
    Strands of Actinomyces viscosus — Stock Photo
    Strands of Actinomyces viscosus
    Ovarian cancer cells, coloured scanning electron micrograph. — Stock Photo
    Ovarian cancer cells, coloured scanning electron micrograph.
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells — Stock Photo
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells
    Dentures on table against white background. — Stock Photo
    Dentures on table against white background.
    Pancreatic cancer cells — Stock Photo
    Pancreatic cancer cells
    Coloured scanning electron micrograph of ovarian cancer cells. — Stock Photo
    Coloured scanning electron micrograph of ovarian cancer cells.
    Bone cancer cells. Coloured scanning electron micrograph of osteosarcoma cancer cells. Osteosarcoma is an aggressive malignant neoplasm arising from primitive transformed mesenchymal cells — Stock Photo
    Bone cancer cells. Coloured scanning electron micrograph of osteosarcoma cancer cells. Osteosarcoma is an aggressive malignant neoplasm arising from primitive transformed mesenchymal cells
    Scanning electron microscopy of DNA molecules and red and white blood cells. — Stock Photo
    Scanning electron microscopy of DNA molecules and red and white blood cells.
    Blastocyst hollow ball of cells with fluid, digital illustration. — Stock Photo
    Blastocyst hollow ball of cells with fluid, digital illustration.
    Phlox pollen grain — Stock Photo
    Phlox pollen grain
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles. — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles.
    Breast cancer screening — Stock Photo
    Breast cancer screening
    Arthritic hand anatomy — Stock Photo
    Arthritic hand anatomy
    Cat flea. Coloured scanning electron micrograph (SEM) of a cat flea (Ctenocephalides felis). Its body is laterally-flattened to allow it to move easily through the fur of its cat host. The flea's antennae can be withdrawn into its head — Stock Photo
    Cat flea. Coloured scanning electron micrograph (SEM) of a cat flea (Ctenocephalides felis). Its body is laterally-flattened to allow it to move easily through the fur of its cat host. The flea's antennae can be withdrawn into its head