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    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Puffball fungus spores — Stock Photo
    Puffball fungus spores
    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.
    Centric fossil diatom frustule — Stock Photo
    Centric fossil diatom frustule
    Human tooth fractured enamel, coloured scanning electron micrograph (SEM). — Stock Photo
    Human tooth fractured enamel, coloured scanning electron micrograph (SEM).
    Male sex cell — Stock Photo
    Male sex cell
    Milkwort pollen grain — Stock Photo
    Milkwort pollen grain
    Sensory palps of Rabbit flea — Stock Photo
    Sensory palps of Rabbit flea
    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
    Green colored dust mite, digital illustration. — Stock Photo
    Green colored dust mite, digital illustration.
    Scanning electron micrograph (SEM) of a PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph (SEM) of a PC12 neurone in culture.
    Adenocarcinoma of the thyroid gland — Stock Photo
    Adenocarcinoma of the thyroid gland
    Purkinje cells and their dendritic processes — Stock Photo
    Purkinje cells and their dendritic processes
    Light micrograph of onion (Allium cepa) root tip cells undergoing mitosis (nuclear division). — Stock Photo
    Light micrograph of onion (Allium cepa) root tip cells undergoing mitosis (nuclear division).
    Dividing prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Dividing prostate cancer cells, coloured scanning electron micrograph.
    Colored scanning electron micrograph of mains cable damaged by mouse teeth. — Stock Photo
    Colored scanning electron micrograph of mains cable damaged by mouse teeth.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Breast tissue showing adenocarcinoma — Stock Photo
    Breast tissue showing adenocarcinoma
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    Fat cells and supportive connective tissue — Stock Photo
    Fat cells and supportive connective tissue
    Limescale, coloured scanning electron micrograph (SEM). — Stock Photo
    Limescale, coloured scanning electron micrograph (SEM).
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus — Stock Photo
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    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
    Scientist pointing at scanning electron micrographs of different nanofibre structures. — Stock Photo
    Scientist pointing at scanning electron micrographs of different nanofibre structures.
    Bone marrow cellular structure — Stock Photo
    Bone marrow cellular structure
    Bougainvillea pollen grain — Stock Photo
    Bougainvillea pollen grain
    Confocal light micrograph of mammalian fibroblast cells. — Stock Photo
    Confocal light micrograph of mammalian fibroblast cells.
    Ruptured venule running through fatty tissue — Stock Photo
    Ruptured venule running through fatty tissue
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death. — Stock Photo
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death.
    Methicillin-resistant Staphylococcus aureus — Stock Photo
    Methicillin-resistant Staphylococcus aureus
    Smokers lungs, digital illustration and light micrograph on white background. — Stock Photo
    Smokers lungs, digital illustration and light micrograph on white background.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    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.
    Staphylococcus aureus coccoid bacteria, colored scanning electron micrograph. — Stock Photo
    Staphylococcus aureus coccoid bacteria, colored scanning electron micrograph.
    Section through an osteoid osteoma — Stock Photo
    Section through an osteoid osteoma
    Asparagus beetle head — Stock Photo
    Asparagus beetle head
    Odontoblasts and the dental pulp — Stock Photo
    Odontoblasts and the dental pulp
    Fungal cells showing sporangium — Stock Photo
    Fungal cells showing sporangium
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph. — Stock Photo
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph.
    Campylodiscus fastuosus diatom — Stock Photo
    Campylodiscus fastuosus diatom
    Large thrombus formation — Stock Photo
    Large thrombus formation
    Prostate tissue showing Iadenocarcinoma — Stock Photo
    Prostate tissue showing Iadenocarcinoma
    Parotid salivary gland — Stock Photo
    Parotid salivary gland
    Hyaline cartilage, a semi-rigid connective tissue — Stock Photo
    Hyaline cartilage, a semi-rigid connective tissue
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Blade of grass with a serrated edge — Stock Photo
    Blade of grass with a serrated edge
    Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain. — Stock Photo
    Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain.
    Illustration of abstract cancer cell with tentacles. — Stock Photo
    Illustration of abstract cancer cell with tentacles.
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Blood cells, light micrograph. — Stock Photo
    Blood cells, light micrograph.
    Human red blood cells — Stock Photo
    Human red blood cells
    Human hair with dandruff and close-up of light micrograph, digital artwork. — Stock Photo
    Human hair with dandruff and close-up of light micrograph, digital artwork.
    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.
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria. — Stock Photo
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria.
    Horse chestnut pollen grain — Stock Photo
    Horse chestnut pollen grain
    Activated blood cell fragments platelets, coloured scanning electron micrograph. — Stock Photo
    Activated blood cell fragments platelets, coloured scanning electron micrograph.
    Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain. — Stock Photo
    Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain.