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    Endorphin molecules binding to receptors, illustration. — Stock Photo
    Endorphin molecules binding to receptors, illustration.
    Light micrograph of goblet cells in colon. — Stock Photo
    Light micrograph of goblet cells in colon.
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    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.
    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.
    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).
    Layer of cells, light micrograph and computer illustration. — Stock Photo
    Layer of cells, light micrograph and computer illustration.
    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).
    Transverse section through a leaf showing foveate stomata (light areas on underside of leaf. — Stock Photo
    Transverse section through a leaf showing foveate stomata (light areas on underside of leaf.
    Freeze-fractured lens of an eye — Stock Photo
    Freeze-fractured lens of an eye
    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.
    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.
    Light micrograph (LM) of a section through the fingertip. — Stock Photo
    Light micrograph (LM) of a section through the fingertip.
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs. — Stock Photo
    Light micrograph (LM) of a vertical section through the pseudostratified columnar epithelium from the trachea, the tube in the throat leading from the mouth to the bronchus and the lungs.
    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).
    Fallopian tube, TEM — Stock Photo
    Fallopian tube, TEM
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    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).
    Coloured transmission electron micrograph (TEM) of a section through a Langerhans cell from the epidermis of the skin. — Stock Photo
    Coloured transmission electron micrograph (TEM) of a section through a Langerhans cell from the epidermis of the skin.
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Cross-section through a fallopian tube — Stock Photo
    Cross-section through a fallopian tube
    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.
    Gum tissue with gingivitis — Stock Photo
    Gum tissue with gingivitis
    Adenocarcinoma of the sigmoid colon — Stock Photo
    Adenocarcinoma of the sigmoid colon
    Section through the olfactory epithelium — Stock Photo
    Section through the olfactory epithelium
    Section through the nasal mucosa — Stock Photo
    Section through the nasal mucosa
    Gum tissue with gingivitis — Stock Photo
    Gum tissue with gingivitis
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Trachea lined with ciliated columnar epithelium — Stock Photo
    Trachea lined with ciliated columnar epithelium
    Cross-section through a fallopian tube — Stock Photo
    Cross-section through a fallopian tube
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Paranasal sinus epithelium — Stock Photo
    Paranasal sinus epithelium
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Epithelium from a fallopian tube — Stock Photo
    Epithelium from a fallopian tube
    Section through the olfactory epithelium — Stock Photo
    Section through the olfactory epithelium
    Fallopian tube cellular structure — Stock Photo
    Fallopian tube cellular structure
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Duct is lined with pseudostratified epithelium — Stock Photo
    Duct is lined with pseudostratified epithelium
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Fallopian tube cellular structure — Stock Photo
    Fallopian tube cellular structure
    Iris stem cellular structure — Stock Photo
    Iris stem cellular structure
    Bile duct cellular sctructure — Stock Photo
    Bile duct cellular sctructure
    Gum tissue with gingivitis — Stock Photo
    Gum tissue with gingivitis
    Bone marrow cellular structure — Stock Photo
    Bone marrow cellular structure
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Red blood cells — Stock Photo
    Red blood cells
    Visual rendering of Animal cells — Stock Photo
    Visual rendering of Animal cells
    Visual rendering of Animal cells — Stock Photo
    Visual rendering of Animal cells
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Animal Cells in culture — Stock Photo
    Animal Cells in culture
    Animal cell structure — Stock Photo
    Animal cell structure
    Structure of cellular organelles — Stock Photo
    Structure of cellular organelles
    Visual rendering of Animal cells — Stock Photo
    Visual rendering of Animal cells
    Animal Cells in culture — Stock Photo
    Animal Cells in culture
    Animal Cells in culture — Stock Photo
    Animal Cells in culture
    Cellular organelles and mitochondrion — Stock Photo
    Cellular organelles and mitochondrion
    Nerve cells and axon structures — Stock Photo
    Nerve cells and axon structures
    Human sperm cells — Stock Photo
    Human sperm cells