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    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.
    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).
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    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
    Section through a full term placenta — Stock Photo
    Section through a full term placenta
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Lobar pneumonia in stage of congestion and consolidation, digital illustration and light micrograph. — Stock Photo
    Lobar pneumonia in stage of congestion and consolidation, digital illustration and light micrograph.
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Simple columnar epithelium, light micrograph — Stock Photo
    Simple columnar epithelium, light micrograph
    Digital illustration and light micrograph of squamous cell carcinoma of lung. — Stock Photo
    Digital illustration and light micrograph of squamous cell carcinoma of lung.
    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
    Human blood cells — Stock Photo
    Human blood cells
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph. — Stock Photo
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Hair follicles structure — Stock Photo
    Hair follicles structure
    Activated human macrophage — Stock Photo
    Activated human macrophage
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Colored scanning electron micrograph of protective dendritic cell of immune system. — Stock Photo
    Colored scanning electron micrograph of protective dendritic cell of immune system.
    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.
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Coloured scanning electron micrograph of tardigrade water bear. — Stock Photo
    Coloured scanning electron micrograph of tardigrade water bear.
    Skeletal muscle fibres — Stock Photo
    Skeletal muscle fibres
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla). — Stock Photo
    Light micrograph (LM). Longitudinal section through the thallus and sporangium of a liverwort (Pellia epiphylla).
    Lymphoma cancer cell. Coloured scanning electron micrograph (SEM) of a lymphoma cell showing early apoptotic changes. A lymphoma is a cell of the immune system that has become cancerous. The cell becomes immortal and can grow indefinitely — Stock Photo
    Lymphoma cancer cell. Coloured scanning electron micrograph (SEM) of a lymphoma cell showing early apoptotic changes. A lymphoma is a cell of the immune system that has become cancerous. The cell becomes immortal and can grow indefinitely
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Coloured scanning electron micrograph of ovarian cancer cells. — Stock Photo
    Coloured scanning electron micrograph of ovarian cancer cells.
    Obelia hydrozoan medusa. Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid. — Stock Photo
    Obelia hydrozoan medusa. Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid.
    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.
    Waterlily pollen (Nymphaea mexicana), coloured scanning electron micrograph (SEM). — Stock Photo
    Waterlily pollen (Nymphaea mexicana), coloured scanning electron micrograph (SEM).
    Colored scanning electron micrograph of metal nanoparticles formed by laser ablation. — Stock Photo
    Colored scanning electron micrograph of metal nanoparticles formed by laser ablation.
    Fungal cells with sporangia and spores — Stock Photo
    Fungal cells with sporangia and spores
    Scanning electron micrograph of Brevibacteria on human feet causing odour. — Stock Photo
    Scanning electron micrograph of Brevibacteria on human feet causing odour.
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    Coloured scanning electron micrograph of bacteria on surface of human tongue. — Stock Photo
    Coloured scanning electron micrograph of bacteria on surface of human tongue.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Coloured scanning electron micrograph of bacteria cultured from used dishcloth. — Stock Photo
    Coloured scanning electron micrograph of bacteria cultured from used dishcloth.
    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
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left). — Stock Photo
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left).
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Pseudostratified epithelium, light micrograph. Pseudostratified epithelium is a type of epithelium that comprises only a single layer of cells. — Stock Photo
    Pseudostratified epithelium, light micrograph. Pseudostratified epithelium is a type of epithelium that comprises only a single layer of cells.
    Colon lining and mucous producing cells — Stock Photo
    Colon lining and mucous producing cells
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with cirrhosis, showing fibrosis and lack of a functional liver anatomy. — Stock Photo
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with cirrhosis, showing fibrosis and lack of a functional liver anatomy.
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Milkwort pollen grain — Stock Photo
    Milkwort pollen grain
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung
    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.
    Neutrophil cells aggregating at site of infection — Stock Photo
    Neutrophil cells aggregating at site of infection
    Vaccinia virus particle — Stock Photo
    Vaccinia virus particle
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Immature parasitic trematode — Stock Photo
    Immature parasitic trematode
    Prostate showing a concretion of secretory materials — Stock Photo
    Prostate showing a concretion of secretory materials
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres