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    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Great coneflower (Rudbeckia maxima), coloured X-ray. — Stock Photo
    Great coneflower (Rudbeckia maxima), coloured X-ray.
    Patient with a heart pacemaker — Stock Photo
    Patient with a heart pacemaker
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Coloured scanning electron micrograph of human cancellous spongy bone tissue. — Stock Photo
    Coloured scanning electron micrograph of human cancellous spongy bone tissue.
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Red blood cells — Stock Photo
    Red blood cells
    Colored scanning electron micrograph of starch grains in seed of legume. — Stock Photo
    Colored scanning electron micrograph of starch grains in seed of legume.
    Illustration of fruiting bodies and hyphae of fungus Aspergillus fumigatus. — Stock Photo
    Illustration of fruiting bodies and hyphae of fungus Aspergillus fumigatus.
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Red blood cells and platelets — Stock Photo
    Red blood cells and platelets
    Coloured scanning electron micrograph of macrophage white blood cell. — Stock Photo
    Coloured scanning electron micrograph of macrophage white blood cell.
    Degenerative foot deformation — Stock Photo
    Degenerative foot deformation
    Blue brain tumour on magnetic resonance imaging scan, illustration. — Stock Photo
    Blue brain tumour on magnetic resonance imaging scan, illustration.
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Strands of Actinomyces viscosus — Stock Photo
    Strands of Actinomyces viscosus
    Hair follicles. Coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together — Stock Photo
    Hair follicles. Coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together
    Human eyelash mites — Stock Photo
    Human eyelash mites
    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.
    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.
    Colored scanning electron micrograph of breast cancer cell. — Stock Photo
    Colored scanning electron micrograph of breast cancer cell.
    Shoulder and elbow joints anatomy — Stock Photo
    Shoulder and elbow joints anatomy
    Chest, neck and head arteries — Stock Photo
    Chest, neck and head arteries
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli — Stock Photo
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli
    Cells of brewer yeast — Stock Photo
    Cells of brewer yeast
    Colored scanning electron micrograph of Streptococcus mutans anaerobic bacteria in normal bacteria flora of mouth. — Stock Photo
    Colored scanning electron micrograph of Streptococcus mutans anaerobic bacteria in normal bacteria flora of mouth.
    Alarm clock, coloured X-ray. — Stock Photo
    Alarm clock, coloured X-ray.
    Coloured scanning electron micrograph of tardigrade water bear. — Stock Photo
    Coloured scanning electron micrograph of tardigrade water bear.
    Colored scanning electron micrograph of pollen grains from convolvulus flower. — Stock Photo
    Colored scanning electron micrograph of pollen grains from convolvulus flower.
    Coloured scanning electron micrograph of bacteria cultured from mobile phone surface. — Stock Photo
    Coloured scanning electron micrograph of bacteria cultured from mobile phone surface.
    Breast cancer cells growing in culture — Stock Photo
    Breast cancer cells growing in culture
    Normal skull structure of young adult — Stock Photo
    Normal skull structure of young adult
    Normal blood vessels, X-ray — Stock Photo
    Normal blood vessels, X-ray
    Breast cancer screening — Stock Photo
    Breast cancer screening
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Poppy (Papaver orientalis), coloured X-ray — Stock Photo
    Poppy (Papaver orientalis), coloured X-ray
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower. — Stock Photo
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower.
    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
    Thyroid gland showing the follicles — Stock Photo
    Thyroid gland showing the follicles
    Coloured chest X-ray showing aspiration (dark areas) in the lungs of a 76-year-old female patient with an extensive brain haemorrhage. — Stock Photo
    Coloured chest X-ray showing aspiration (dark areas) in the lungs of a 76-year-old female patient with an extensive brain haemorrhage.
    Dividing prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Dividing prostate cancer cells, coloured scanning electron micrograph.
    Lung tissue, coloured transmission electron micrograph (TEM). of a pulmonary capillary containing two red blood cells (red) and three platelets (brown). A basement membrane (cyan) surround the endothelium separating it from the alveolar epithelium — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM). of a pulmonary capillary containing two red blood cells (red) and three platelets (brown). A basement membrane (cyan) surround the endothelium separating it from the alveolar epithelium
    Human hair, coloured scanning electron micrograph (SEM). — Stock Photo
    Human hair, coloured scanning electron micrograph (SEM).
    Briefcase with various items, coloured X-ray. — Stock Photo
    Briefcase with various items, coloured X-ray.
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut — Stock Photo
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Coloured scanning electron micrograph (SEM) of a fractured bile duct. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured bile duct.
    Blood clotting in an ovarian follicle — Stock Photo
    Blood clotting in an ovarian follicle
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female — Stock Photo
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female
    Ant head. Coloured scanning electron micrograph (SEM) of the head of an ant (family Formicidae). showing its large compound eyes (red) and jaws. Magnification: x50 when printed 10 centimetres wide. — Stock Photo
    Ant head. Coloured scanning electron micrograph (SEM) of the head of an ant (family Formicidae). showing its large compound eyes (red) and jaws. Magnification: x50 when printed 10 centimetres wide.
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph. — Stock Photo
    Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph.
    Prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Prostate cancer cells, coloured scanning electron micrograph.
    Geranium pollen grain — Stock Photo
    Geranium pollen grain
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    Colored X-ray of section through thoracic spine of senior male patient with ankylosing spondylitis with severe degeneration of lower thoracic spine. — Stock Photo
    Colored X-ray of section through thoracic spine of senior male patient with ankylosing spondylitis with severe degeneration of lower thoracic spine.
    Salt water pennate diatom frustule — Stock Photo
    Salt water pennate diatom frustule
    Fat (adipose) tissue, coloured scanning electron micrograph (SEM). The fat cells (adipocytes, round) are surrounded by collagen fibres. — Stock Photo
    Fat (adipose) tissue, coloured scanning electron micrograph (SEM). The fat cells (adipocytes, round) are surrounded by collagen fibres.
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium