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    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Lime tree stem — Stock Photo
    Lime tree stem
    Escherichia coli bacteria on gecko tongue — Stock Photo
    Escherichia coli bacteria on gecko tongue
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin.
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    Normal human renal artery — Stock Photo
    Normal human renal artery
    Bird bone tissue — Stock Photo
    Bird bone tissue
    Scanning electron micrograph of faecal bacteria cultured from sample of human faeces. — Stock Photo
    Scanning electron micrograph of faecal bacteria cultured from sample of human faeces.
    Gall bladder lining — Stock Photo
    Gall bladder lining
    Section through a lily stem — Stock Photo
    Section through a lily stem
    Myelinated nerve fibres — Stock Photo
    Myelinated nerve fibres
    Activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Activated blood cell fragments platelets, coloured scanning electron micrograph.
    HIV particles in the bloodstream — Stock Photo
    HIV particles in the bloodstream
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Pollen grains of a common daisy — Stock Photo
    Pollen grains of a common daisy
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen. — Stock Photo
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen.
    Human stomach adenocarcinoma, computer illustration and light micrograph. — Stock Photo
    Human stomach adenocarcinoma, computer illustration and light micrograph.
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree. — Stock Photo
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree.
    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
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Limescale, coloured scanning electron micrograph (SEM). — Stock Photo
    Limescale, coloured scanning electron micrograph (SEM).
    Pyoderma skin disease — Stock Photo
    Pyoderma skin disease
    Cat flea head — Stock Photo
    Cat flea head
    Paramecium sp. ciliate protozoa — Stock Photo
    Paramecium sp. ciliate protozoa
    Scanning electron micrograph of bacteria cultured from sample of human faeces. — Stock Photo
    Scanning electron micrograph of bacteria cultured from sample of human faeces.
    Rapeseed pollen grain — Stock Photo
    Rapeseed pollen grain
    Female copepod with eggs — Stock Photo
    Female copepod with eggs
    Adenocarcinoma of the endometrium — Stock Photo
    Adenocarcinoma of the endometrium
    Human blood cells — Stock Photo
    Human blood cells
    Sapphire, SEM — Stock Photo
    Sapphire, SEM
    Diatoms single-celled algae — Stock Photo
    Diatoms single-celled algae
    Coloured scanning electron micrograph (SEM) of a wood anemone (Anemone nemerosa) anther (male reproductive part) covered in pollen. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a wood anemone (Anemone nemerosa) anther (male reproductive part) covered in pollen.
    Human smooth muscle, light micrograph. — Stock Photo
    Human smooth muscle, light micrograph.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample. — Stock Photo
    Colored scanning electron micrograph of activated T lymphocyte from human blood sample.
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph. — Stock Photo
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph.
    Male human flea — Stock Photo
    Male human flea
    Healthy human skin — Stock Photo
    Healthy human skin
    Scanning electron micrograph of dermestid beetle head. — Stock Photo
    Scanning electron micrograph of dermestid beetle head.
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Coiled proboscis of a moth — Stock Photo
    Coiled proboscis of a moth
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible. — Stock Photo
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible.
    Crenated red blood cells — Stock Photo
    Crenated red blood cells
    Plantar skin, light micrograph (LM) of sectioned foot sole skin. The skin on the soles of the feet is referred to as plantar skin as the outer layer of keratin (stratum corneum) (top) is much thicker here than in the rest of the body — Stock Photo
    Plantar skin, light micrograph (LM) of sectioned foot sole skin. The skin on the soles of the feet is referred to as plantar skin as the outer layer of keratin (stratum corneum) (top) is much thicker here than in the rest of the body
    Digital illustration and light micrograph of squamous cell carcinoma of lung. — Stock Photo
    Digital illustration and light micrograph of squamous cell carcinoma of lung.
    Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food — Stock Photo
    Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food
    Radiolaria protozoa shells — Stock Photo
    Radiolaria protozoa shells
    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
    Purkinje neurons in the cerebellum — Stock Photo
    Purkinje neurons in the cerebellum
    Zika virus particles — Stock Photo
    Zika virus particles
    Scanning electron micrograph of head of pork tapeworm intestinal parasite. — Stock Photo
    Scanning electron micrograph of head of pork tapeworm intestinal parasite.
    Human stomach mucinous adenocarcinoma, computer illustration and light micrograph. — Stock Photo
    Human stomach mucinous adenocarcinoma, computer illustration and light micrograph.
    False-colour scanning electron micrograph of a section of healthy lung tissue, showing the microscopic air sacs (alveoli) where gas exchange takes place. — Stock Photo
    False-colour scanning electron micrograph of a section of healthy lung tissue, showing the microscopic air sacs (alveoli) where gas exchange takes place.
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Escherichia coli bacteria on gecko tongue — Stock Photo
    Escherichia coli bacteria on gecko tongue
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis — Stock Photo
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis
    Fat cell. Coloured scanning electron micrograph (SEM) of part of a fat-storing cell (adipocytes). Fat cells are one of the largest cell types in the human body, each cell being 100 to 120 microns in diameter — Stock Photo
    Fat cell. Coloured scanning electron micrograph (SEM) of part of a fat-storing cell (adipocytes). Fat cells are one of the largest cell types in the human body, each cell being 100 to 120 microns in diameter