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    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)
    Maize root. Light micrograph (LM) of section through root of maize plant (Zea mays) showing typical monocot arrangement of vascular bundles. central vascular cylinder is comprised of central cluster of parenchyma cells — Stock Photo
    Maize root. Light micrograph (LM) of section through root of maize plant (Zea mays) showing typical monocot arrangement of vascular bundles. central vascular cylinder is comprised of central cluster of parenchyma cells
    Transparent human body showing heart and main circulatory system with internal organs, nervous, lymphatic and circulatory systems — Stock Photo
    Transparent human body showing heart and main circulatory system with internal organs, nervous, lymphatic and circulatory systems
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Illustration of colon in male body silhouette on white background. — Stock Photo
    Illustration of colon in male body silhouette on white background.
    Illustration of female silhouette with highlighted rectum cancer. — Stock Photo
    Illustration of female silhouette with highlighted rectum cancer.
    Illustration of senior woman with colon tumour on black background. — Stock Photo
    Illustration of senior woman with colon tumour on black background.
    Anatomy of human abdominal muscles — Stock Photo
    Anatomy of human abdominal muscles
    Mid section illustration of colon in male body silhouette. — Stock Photo
    Mid section illustration of colon in male body silhouette.
    Cardiac muscle from a healthy heart — Stock Photo
    Cardiac muscle from a healthy heart
    Medical illustration of the midbrain transverse section — Stock Photo
    Medical illustration of the midbrain transverse section
    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
    Human Colon, computer illustration — Stock Photo
    Human Colon, computer illustration
    Illustration of blue silhouette of obese woman with highlighted colon on white background. — Stock Photo
    Illustration of blue silhouette of obese woman with highlighted colon on white background.
    Large intestine, computer illustration — Stock Photo
    Large intestine, computer illustration
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Colon cancer in male body, conceptual computer illustration. — Stock Photo
    Colon cancer in male body, conceptual computer illustration.
    Woody stem section. Coloured scanning electron micrograph (SEM) of a transverse section through the stem of a woody plant. The majority of tissue seen here is secondary xylem (dark brown) — Stock Photo
    Woody stem section. Coloured scanning electron micrograph (SEM) of a transverse section through the stem of a woody plant. The majority of tissue seen here is secondary xylem (dark brown)
    Medical illustration of human digestive system with labels — Stock Photo
    Medical illustration of human digestive system with labels
    Illustration of silhouette of obese man with visible colon. — Stock Photo
    Illustration of silhouette of obese man with visible colon.
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Male anatomy showing Nasalis transverse muscle, computer illustration. — Stock Photo
    Male anatomy showing Nasalis transverse muscle, computer illustration.
    Illustration of female silhouette with highlighted colon. — Stock Photo
    Illustration of female silhouette with highlighted colon.
    Male anatomy with orange colored large intestine, digital illustration. — Stock Photo
    Male anatomy with orange colored large intestine, digital illustration.
    Anatomy of human salivary glands with labels — Stock Photo
    Anatomy of human salivary glands with labels
    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.
    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)
    Illustration of colon in male body silhouette on black background. — Stock Photo
    Illustration of colon in male body silhouette on black background.
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases — Stock Photo
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases
    Anatomy of human salivary glands — Stock Photo
    Anatomy of human salivary glands
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems — Stock Photo
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems
    Illustration of female silhouette with highlighted colon infection. — Stock Photo
    Illustration of female silhouette with highlighted colon infection.
    Cilia covering the epithelial lining of the nasopharyx — Stock Photo
    Cilia covering the epithelial lining of the nasopharyx
    Male anatomy showing Nasalis transverse muscle, computer illustration. — Stock Photo
    Male anatomy showing Nasalis transverse muscle, computer illustration.
    Frontal illustration of blue silhouette of obese woman with highlighted colon on black background. — Stock Photo
    Frontal illustration of blue silhouette of obese woman with highlighted colon on black background.
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems — Stock Photo
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems
    Marsh marigold carpel — Stock Photo
    Marsh marigold carpel
    Illustration of silhouette of obese man with visible colon. — Stock Photo
    Illustration of silhouette of obese man with visible colon.
    Myelinated nerve fibres — Stock Photo
    Myelinated nerve fibres
    Bowel cancer in female body, conceptual computer illustration. — Stock Photo
    Bowel cancer in female body, conceptual computer illustration.
    Illustration of colon in transparent male silhouette. — Stock Photo
    Illustration of colon in transparent male silhouette.
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases — Stock Photo
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases
    Digital illustration of colon in senior man body. — Stock Photo
    Digital illustration of colon in senior man body.
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Anatomy of human abdominal vein system — Stock Photo
    Anatomy of human abdominal vein system
    Illustration of senior woman silhouette with colored colon on white background. — Stock Photo
    Illustration of senior woman silhouette with colored colon on white background.
    Human skeleton with red colored Nasalis transverse muscle, digital illustration. — Stock Photo
    Human skeleton with red colored Nasalis transverse muscle, digital illustration.
    Cells undergoing mitosis — Stock Photo
    Cells undergoing mitosis
    Sectional view of large intestine — Stock Photo
    Sectional view of large intestine
    Hair follicles of human skin — Stock Photo
    Hair follicles of human skin
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases — Stock Photo
    Antibodies attacking neurons. Conceptual computer illustration of autoimmune neurologic diseases
    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.
    Anatomy of normal large intestine — Stock Photo
    Anatomy of normal large intestine
    Illustration of female silhouette with highlighted colon. — Stock Photo
    Illustration of female silhouette with highlighted colon.