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    Light micrograph of a cross section through a grape vine (Vitis sp.) stem. — Stock Photo
    Light micrograph of a cross section through a grape vine (Vitis sp.) stem.
    Human sperm cells — Stock Photo
    Human sperm cells
    Gall bladder lining — Stock Photo
    Gall bladder lining
    Fallopian tube cellular structure — Stock Photo
    Fallopian tube cellular structure
    Light micrograph (LM) of the nasal sinuses ( lined by brown epithelium ) and the supporting cartilages (pink). — Stock Photo
    Light micrograph (LM) of the nasal sinuses ( lined by brown epithelium ) and the supporting cartilages (pink).
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Animal Cells in culture — Stock Photo
    Animal Cells in culture
    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.
    Trachea lined with ciliated columnar epithelium — Stock Photo
    Trachea lined with ciliated columnar epithelium
    Human sperm cells — Stock Photo
    Human sperm cells
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Section through the olfactory epithelium — Stock Photo
    Section through the olfactory epithelium
    Animal Cells in culture — Stock Photo
    Animal Cells in culture
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Section through the nasal mucosa — Stock Photo
    Section through the nasal mucosa
    Visual rendering of Animal cells — Stock Photo
    Visual rendering of Animal cells
    Adenocarcinoma of the sigmoid colon — Stock Photo
    Adenocarcinoma of the sigmoid colon
    Cellular organelles and mitochondrion — Stock Photo
    Cellular organelles and mitochondrion
    Epithelium from a fallopian tube — Stock Photo
    Epithelium from a fallopian tube
    Human sperm cells — Stock Photo
    Human sperm cells
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a fractured mucous membrane of the trachea (wind pipe), showing the epithelium and underlying connective tissue.
    Transparent cells on grey background, digital illustration. — Stock Photo
    Transparent cells on grey background, digital illustration.
    Magnified digital illustration of megakaryocyte cell. — Stock Photo
    Magnified digital illustration of megakaryocyte cell.
    Nerve cells and axon structures — Stock Photo
    Nerve cells and axon structures
    Endorphin molecules binding to receptors, illustration. — Stock Photo
    Endorphin molecules binding to receptors, illustration.
    3d illustration of blue cells pattern with yellow nuclei. — Stock Photo
    3d illustration of blue cells pattern with yellow nuclei.
    Close-up 3d illustration of blue cells pattern with red nuclei. — Stock Photo
    Close-up 3d illustration of blue cells pattern with red nuclei.
    Pink molecular model of DNA binding to anti-cancer protein p53. — Stock Photo
    Pink molecular model of DNA binding to anti-cancer protein p53.
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Neutrophil white blood cell in blood, digital artwork. — Stock Photo
    Neutrophil white blood cell in blood, digital artwork.
    Gum tissue with gingivitis — Stock Photo
    Gum tissue with gingivitis
    Gum tissue with gingivitis — Stock Photo
    Gum tissue with gingivitis
    Layer of cells, computer illustration — Stock Photo
    Layer of cells, computer illustration
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Animal cell structure — Stock Photo
    Animal cell structure
    Illustration of motor protein cellular structure. — Stock Photo
    Illustration of motor protein cellular structure.
    Magnified digital illustration of dendritic cell. — Stock Photo
    Magnified digital illustration of dendritic cell.
    Digital illustration of structure of bilayer with phospholipids plasma membrane enclosing cells. — Stock Photo
    Digital illustration of structure of bilayer with phospholipids plasma membrane enclosing cells.
    Cell membrane, illustration, colorful image — Stock Photo
    Cell membrane, illustration, colorful image
    3d illustration of a Golgi apparatus, or body, within a eukaryotic cell. Golgi are membrane-bound organelles that modify and package proteins. — Stock Photo
    3d illustration of a Golgi apparatus, or body, within a eukaryotic cell. Golgi are membrane-bound organelles that modify and package proteins.
    Layer of cells, light micrograph and computer illustration. — Stock Photo
    Layer of cells, light micrograph and computer illustration.
    Layer of cells, computer illustration — Stock Photo
    Layer of cells, computer illustration
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration. — Stock Photo
    Monocyte and lymphocyte white blood cells in blood smear, digital illustration.
    Illustration of blue cell membrane on white background. — Stock Photo
    Illustration of blue cell membrane on white background.
    Transparent cells on white background, digital illustration. — Stock Photo
    Transparent cells on white background, digital illustration.
    Structure of animal cell — Stock Photo
    Structure of animal cell
    Single abstract bacterium on black background, computer illustration. — Stock Photo
    Single abstract bacterium on black background, computer illustration.
    Magnified digital illustration of eosinophil cell. — Stock Photo
    Magnified digital illustration of eosinophil cell.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Illustration of motor protein cellular structure. — Stock Photo
    Illustration of motor protein cellular structure.
    Monocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Monocyte white blood cell in blood smear, digital illustration.
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Basophil white blood cell and red blood cells, digital illustration. — Stock Photo
    Basophil white blood cell and red blood cells, digital illustration.
    Basophil white blood cell, digital illustration. — Stock Photo
    Basophil white blood cell, digital illustration.
    Structure of animal cell — Stock Photo
    Structure of animal cell
    Structure of neutrophil white blood cell, digital illustration. — Stock Photo
    Structure of neutrophil white blood cell, digital illustration.
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    3d illustration of internal structure of human cell. — Stock Photo
    3d illustration of internal structure of human cell.