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    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant — Stock Photo
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant
    Lungs cancer, digital illustration showing malignant tumour in lung. — Stock Photo
    Lungs cancer, digital illustration showing malignant tumour in lung.
    Light micrograph of necrotic oesophagitis. Haematoxylin and eosin stain. — Stock Photo
    Light micrograph of necrotic oesophagitis. Haematoxylin and eosin stain.
    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).
    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
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis — Stock Photo
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Haversian canals in compact bone, light micrograph. — Stock Photo
    Haversian canals in compact bone, light micrograph.
    Smokers lungs, digital illustration and light micrograph on white background. — Stock Photo
    Smokers lungs, digital illustration and light micrograph on white background.
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver — Stock Photo
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant — Stock Photo
    Helianthus stem. Light micrograph (LM) of stem of perennial sunflower (Helianthus sp.) in cross-section showing vascular bundles (green, yellow). Vascular tissues transport water and dissolved substances inside plant
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Lung cancer, digital illustration and light micrograph showing lung adenocarcinoma. — Stock Photo
    Lung cancer, digital illustration and light micrograph showing lung adenocarcinoma.
    PC12 neurone in culture — Stock Photo
    PC12 neurone in culture
    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.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow) — Stock Photo
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow)
    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail. — Stock Photo
    Light micrograph (LM) of longitudinal section through a fetal finger tip to show the developing nail.
    Dust mite, light micrograph — Stock Photo
    Dust mite, light micrograph
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Tapeworm of cattle and other grazing animals, light micrograph. — Stock Photo
    Tapeworm of cattle and other grazing animals, light micrograph.
    Appendix showing appendicitis — Stock Photo
    Appendix showing appendicitis
    Onion cells undergoing mitosis — Stock Photo
    Onion cells undergoing mitosis
    Metastatic breast cancer — Stock Photo
    Metastatic breast cancer
    Human stomach adenocarcinoma, computer illustration and light micrograph. — Stock Photo
    Human stomach adenocarcinoma, computer illustration and light micrograph.
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Scientist checking nanofibre structure under light microscope. — Stock Photo
    Scientist checking nanofibre structure under light microscope.
    Light micrograph of single-celled Amoeba engulfing protozoan Paramecium. — Stock Photo
    Light micrograph of single-celled Amoeba engulfing protozoan Paramecium.
    Human compact bone tissue, light micrograph. — Stock Photo
    Human compact bone tissue, light micrograph.
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Acute pyelonephritis, computer illustration and light micrograph — Stock Photo
    Acute pyelonephritis, computer illustration and light micrograph
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Human cardiac tissue, light micrograph. Haematoxylin and eosin stain. — Stock Photo
    Human cardiac tissue, light micrograph. Haematoxylin and eosin stain.
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree. — Stock Photo
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree.
    Hepatic bile duct infected with cocidian protozoa — Stock Photo
    Hepatic bile duct infected with cocidian protozoa
    Large thrombus formation — Stock Photo
    Large thrombus formation
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Human tendon, light micrograph. Haematoxylin and eosin stain. — Stock Photo
    Human tendon, light micrograph. Haematoxylin and eosin stain.
    Light micrograph of a section through follicle from a thyroid gland affected by Grave's disease. — Stock Photo
    Light micrograph of a section through follicle from a thyroid gland affected by Grave's disease.
    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.
    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.
    Young pine tree stem — Stock Photo
    Young pine tree stem
    Colon lining and mucous producing cells — Stock Photo
    Colon lining and mucous producing cells
    Simple columnar epithelium, light micrograph — Stock Photo
    Simple columnar epithelium, light micrograph
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue. — Stock Photo
    Light micrograph of a section through the surface of a tonsil showing the stratified squamous epithelium (pink) and underlying lymphoid tissue.
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver — Stock Photo
    Liver cirrhosis. Computer illustration and light micrograph of a section through a human liver with from primary biliary cirrhosis. Cirrhosis is a disease in which bands of fibrosis (internal scarring) break up the internal structure of the liver
    Iris stem cellular structure — Stock Photo
    Iris stem cellular structure
    Hair follicles structure — Stock Photo
    Hair follicles structure
    Paranasal sinus epithelium — Stock Photo
    Paranasal sinus epithelium
    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.
    Lime tree stem — Stock Photo
    Lime tree stem
    Section through a wart — Stock Photo
    Section through a wart
    Light micrograph of a cross section of xylem. The xylem is a type of tissue in vascular plants that transports water and some nutrients. — Stock Photo
    Light micrograph of a cross section of xylem. The xylem is a type of tissue in vascular plants that transports water and some nutrients.
    Human blood cells, light micrograph. — Stock Photo
    Human blood cells, light micrograph.
    Section through a wart — Stock Photo
    Section through a wart
    Human cartilage, light micrograph. Cross section of human cartilage bone. Haematoxylin and eosin stain. — Stock Photo
    Human cartilage, light micrograph. Cross section of human cartilage bone. Haematoxylin and eosin stain.
    Root vascular tissue, light micrograph. — Stock Photo
    Root vascular tissue, light micrograph.