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    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.
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells. — Stock Photo
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.
    Mycobacterium smegmatis bacteria — Stock Photo
    Mycobacterium smegmatis bacteria
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system — Stock Photo
    Resting T lymphocytes. Coloured scanning electron micrograph (SEM) of resting T lymphocytes from a human blood sample. T lymphocytes, or T cells, are a type of white blood cell and components of the body's immune system
    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.
    Pancreatic islet cells. Colored transmission electron micrograph (TEM) of a section through pancreas tissue, showing cells known as Islets of Langerhans. These cells occur in distinct ovoid clusters numbering about 1 million in humans — Stock Photo
    Pancreatic islet cells. Colored transmission electron micrograph (TEM) of a section through pancreas tissue, showing cells known as Islets of Langerhans. These cells occur in distinct ovoid clusters numbering about 1 million in humans
    Phlox pollen grain — Stock Photo
    Phlox pollen grain
    Electron micrograph of dental plaque — Stock Photo
    Electron micrograph of dental plaque
    Intestinal brush border in small intestine showing numerous microvilli, colored transmission electron micrograph. — Stock Photo
    Intestinal brush border in small intestine showing numerous microvilli, colored transmission electron micrograph.
    Marine pennate diatom frustule — Stock Photo
    Marine pennate diatom frustule
    Ductal carcinoma of the breast — Stock Photo
    Ductal carcinoma of the breast
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Colored scanning electron micrograph of breast cancer cell. — Stock Photo
    Colored scanning electron micrograph of breast cancer cell.
    Colored scanning electron micrograph of rod-shaped, gram-negative bacteria Escherichia coli of human intestine. — Stock Photo
    Colored scanning electron micrograph of rod-shaped, gram-negative bacteria Escherichia coli of human intestine.
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot — Stock Photo
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot
    Colored scanning electron micrograph of bundles of sensory cilia cells in macula utriculi within labyrinth of human inner ear. — Stock Photo
    Colored scanning electron micrograph of bundles of sensory cilia cells in macula utriculi within labyrinth of human inner ear.
    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
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Pollen grains of a common daisy — Stock Photo
    Pollen grains of a common daisy
    Mouse mammary tumour virus (MMTV) particles (blue), coloured transmission electron micrograph (TEM). MMTV induces malignant tumours in the mammary glands of certain strains of laboratory mice — Stock Photo
    Mouse mammary tumour virus (MMTV) particles (blue), coloured transmission electron micrograph (TEM). MMTV induces malignant tumours in the mammary glands of certain strains of laboratory mice
    Male sex cell — Stock Photo
    Male sex cell
    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.
    Arachnoidiscus sp. diatom algae — Stock Photo
    Arachnoidiscus sp. diatom algae
    Leech, coloured scanning electron micrograph (SEM). — Stock Photo
    Leech, coloured scanning electron micrograph (SEM).
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Milkwort pollen grain — Stock Photo
    Milkwort pollen grain
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium
    Coloured scanning electron micrograph of tardigrade water bear. — Stock Photo
    Coloured scanning electron micrograph of tardigrade water bear.
    Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid — Stock Photo
    Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Horse chestnut pollen grain — Stock Photo
    Horse chestnut pollen grain
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species — Stock Photo
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species
    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.
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample. — Stock Photo
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Lung cancer cells — Stock Photo
    Lung cancer cells
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum. — Stock Photo
    Colored scanning electron micrograph of predatory ciliate protozoan Loxophyllum.
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Coloured scanning electron micrograph of macrophage white blood cell. — Stock Photo
    Coloured scanning electron micrograph of macrophage white blood cell.
    Colored scanning electron micrograph of immature pig sperm from epididymis. — Stock Photo
    Colored scanning electron micrograph of immature pig sperm from epididymis.
    Enterococcus coccoid bacteria, colored scanning electron micrograph. — Stock Photo
    Enterococcus coccoid bacteria, colored scanning electron micrograph.
    Hair shafts growing from human skin — Stock Photo
    Hair shafts growing from human skin
    Geranium pollen grain — Stock Photo
    Geranium pollen grain
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Colored scanning electron micrograph of scales from silverfish insect living fossil. — Stock Photo
    Colored scanning electron micrograph of scales from silverfish insect living fossil.
    Scanning electron micrograph of bacteria cultured from sample of human faeces. — Stock Photo
    Scanning electron micrograph of bacteria cultured from sample of human faeces.
    Scanning electron micrograph of head of pork tapeworm intestinal parasite. — Stock Photo
    Scanning electron micrograph of head of pork tapeworm intestinal parasite.
    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.
    Activated human macrophage — Stock Photo
    Activated human macrophage
    Bacteria from a coin. Coloured scanning electron micrograph (SEM) of bacteria cultured from a english one pound coin — Stock Photo
    Bacteria from a coin. Coloured scanning electron micrograph (SEM) of bacteria cultured from a english one pound coin
    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.
    Sperm cells in seminiferous tubule — Stock Photo
    Sperm cells in seminiferous tubule
    Coloured scanning electron micrograph of bacteria cultured from mobile phone. — Stock Photo
    Coloured scanning electron micrograph of bacteria cultured from mobile phone.
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Human red blood cells and platelets — Stock Photo
    Human red blood cells and platelets
    Staphylococcus bacteria cluster — Stock Photo
    Staphylococcus bacteria cluster
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body — Stock Photo
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body