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    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.
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Dog hair, coloured scanning electron micrograph (SEM). — Stock Photo
    Dog hair, coloured scanning electron micrograph (SEM).
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Scanning electron micrograph (SEM) of a PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph (SEM) of a PC12 neurone in culture.
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM). — Stock Photo
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of a section through a foetal olfactory (smelling) sense organ known as the vomeronasal organ (VNO), or Jacobson organ. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a section through a foetal olfactory (smelling) sense organ known as the vomeronasal organ (VNO), or Jacobson organ.
    Dog hair, coloured scanning electron micrograph (SEM).In dogs several hairs emerge from a single follicle. — Stock Photo
    Dog hair, coloured scanning electron micrograph (SEM).In dogs several hairs emerge from a single follicle.
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Kidney glomerulus and podocyte cells — Stock Photo
    Kidney glomerulus and podocyte cells
    Fat cells and supportive connective tissue — Stock Photo
    Fat cells and supportive connective tissue
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Surface of a fallopian tube — Stock Photo
    Surface of a fallopian tube
    Epithelium from a fallopian tube — Stock Photo
    Epithelium from a fallopian tube
    Fractured myelinated nerve fibres — Stock Photo
    Fractured myelinated nerve fibres
    Surface of a fallopian tube — Stock Photo
    Surface of a fallopian tube
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Fractured pancreas tissue — Stock Photo
    Fractured pancreas tissue
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Gram negative Calymmatobacterium sp. — Stock Photo
    Gram negative Calymmatobacterium sp.
    Cape Pankof On Unimak Island — Stock Photo
    Cape Pankof On Unimak Island
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Horse chestnut pollen grain — Stock Photo
    Horse chestnut pollen grain
    Dental plaque scanning electron micrograph — Stock Photo
    Dental plaque scanning electron micrograph
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Climbing lily pollen — Stock Photo
    Climbing lily pollen
    Mycobacterium smegmatis bacteria — Stock Photo
    Mycobacterium smegmatis bacteria
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Heart pacemaker, X-ray — Stock Photo
    Heart pacemaker, X-ray
    Lymphoma cancer cell — Stock Photo
    Lymphoma cancer cell
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Chinese hibiscus pollen — Stock Photo
    Chinese hibiscus pollen
    Chest with a heart pacemaker — Stock Photo
    Chest with a heart pacemaker
    Knee of obese patient with arthritis — Stock Photo
    Knee of obese patient with arthritis
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Red blood cells — Stock Photo
    Red blood cells
    Tumour affecting the pituitary gland — Stock Photo
    Tumour affecting the pituitary gland
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Coiled proboscis of a moth — Stock Photo
    Coiled proboscis of a moth
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Skin cancer cell — Stock Photo
    Skin cancer cell
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Fly head anatomy — Stock Photo
    Fly head anatomy
    Dental plaque scanning electron micrograph — Stock Photo
    Dental plaque scanning electron micrograph
    Brain with aneurysm in the middle cerebral artery — Stock Photo
    Brain with aneurysm in the middle cerebral artery
    Tumour affecting the pituitary gland — Stock Photo
    Tumour affecting the pituitary gland