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    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM). — Stock Photo
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM).
    Kidney glomeruli. Coloured scanning electron micrograph (SEM) of a resin cast of glomeruli capillaries and the larger blood vessels supplying them with blood — Stock Photo
    Kidney glomeruli. Coloured scanning electron micrograph (SEM) of a resin cast of glomeruli capillaries and the larger blood vessels supplying them with blood
    Strawberry pollen grain — Stock Photo
    Strawberry pollen grain
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae. — Stock Photo
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae.
    Fungal cells with sporangia and spores — Stock Photo
    Fungal cells with sporangia and spores
    Chlamydia bacteria, illustration — Stock Photo
    Chlamydia bacteria, illustration
    Peripheral nerve. Coloured transmission electron micrograph (TEM) of a section through a small peripheral nerve. Myelin( blue) is an insulating fatty layer that surrounds the myelinated nerve fibres (pink) — Stock Photo
    Peripheral nerve. Coloured transmission electron micrograph (TEM) of a section through a small peripheral nerve. Myelin( blue) is an insulating fatty layer that surrounds the myelinated nerve fibres (pink)
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats — Stock Photo
    Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats
    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
    Coloured scanning electron micrograph of cancer cell from human colon. — Stock Photo
    Coloured scanning electron micrograph of cancer cell from human colon.
    Geranium pollen grain — Stock Photo
    Geranium pollen grain
    Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times. — Stock Photo
    Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times.
    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.
    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.
    Dense connective tissue, coloured scanning electron micrograph (SEM). — Stock Photo
    Dense connective tissue, coloured scanning electron micrograph (SEM).
    Dividing prostate gland cancer cells, colored scanning electron micrograph. — Stock Photo
    Dividing prostate gland cancer cells, colored scanning electron micrograph.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Ruptured venule running through fatty tissue — Stock Photo
    Ruptured venule running through fatty tissue
    Salmonella typhimurium bacterium — Stock Photo
    Salmonella typhimurium bacterium
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Coloured scanning electron micrograph of cultured cancer cell from human cervix showing numerous microvilli. — Stock Photo
    Coloured scanning electron micrograph of cultured cancer cell from human cervix showing numerous microvilli.
    Staphylococcus bacteria cluster — Stock Photo
    Staphylococcus bacteria cluster
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Kidney stone crystals, coloured scanning electron micrograph (SEM). — Stock Photo
    Kidney stone crystals, coloured scanning electron micrograph (SEM).
    Fossilised fragment of a coccolithotrope skeleton — Stock Photo
    Fossilised fragment of a coccolithotrope skeleton
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Tooth with accumulation of bacterial plaque — Stock Photo
    Tooth with accumulation of bacterial plaque
    Coiled proboscis of a moth — Stock Photo
    Coiled proboscis of a moth
    Myelinated nerve fibres — Stock Photo
    Myelinated nerve fibres
    Coloured scanning electron micrograph (SEM) of an anther (male reproductive part) from a bay tree (Laurus nobilis) flower. — Stock Photo
    Coloured scanning electron micrograph (SEM) of an anther (male reproductive part) from a bay tree (Laurus nobilis) flower.
    Nasturtium leaf. Coloured scanning electron micrograph (SEM) of the underside of a nasturtium leaf (Tropaeolum sp.). Numerous hairs (trichomes) cover the surface — Stock Photo
    Nasturtium leaf. Coloured scanning electron micrograph (SEM) of the underside of a nasturtium leaf (Tropaeolum sp.). Numerous hairs (trichomes) cover the surface
    Fracture through the thyroid gland — Stock Photo
    Fracture through the thyroid gland
    Coloured scanning electron micrograph of cancer cells migrating down pores. — Stock Photo
    Coloured scanning electron micrograph of cancer cells migrating down pores.
    Coloured scanning electron micrograph of ovarian cancer cells. — Stock Photo
    Coloured scanning electron micrograph of ovarian cancer cells.
    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).
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Body of cat flea — Stock Photo
    Body of cat flea
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs — Stock Photo
    Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs
    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.
    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.
    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).
    Diatoms single-celled algae — Stock Photo
    Diatoms single-celled algae
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets. — Stock Photo
    Coloured scanning electron micrograph of human red blood cells, white blood cells and platelets.
    Scanning electron micrograph of bacteria cultured from sample of human faeces. — Stock Photo
    Scanning electron micrograph of bacteria cultured from sample of human faeces.
    Coloured scanning electron micrograph (SEM) of a section through wood showing the phloem vessels (dark green holes) and xylem tissue (lower frame). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through wood showing the phloem vessels (dark green holes) and xylem tissue (lower frame).
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake — Stock Photo
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Oligodendrocyte cell structure — Stock Photo
    Oligodendrocyte cell structure
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze. — Stock Photo
    Coloured scanning electron micrograph of activated platelets attached to surgical gauze.
    Red blood cells with fibrin — Stock Photo
    Red blood cells with fibrin
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.