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    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.
    Epithelium of a foliate papillae of the tongue — Stock Photo
    Epithelium of a foliate papillae of the tongue
    Normal X and y chromosomes — Stock Photo
    Normal X and y chromosomes
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Human skeletal structure — Stock Photo
    Human skeletal structure
    Narrowed artery causing atherosclerosis — Stock Photo
    Narrowed artery causing atherosclerosis
    Human Jawbone anatomy — Stock Photo
    Human Jawbone anatomy
    Human shoulder joint — Stock Photo
    Human shoulder joint
    Child skeletal system — Stock Photo
    Child skeletal system
    Normal human alveoli anatomy — Stock Photo
    Normal human alveoli anatomy
    Pain localized in knee joint — Stock Photo
    Pain localized in knee joint
    Normal human chromosomes — Stock Photo
    Normal human chromosomes
    Shoulder blood supply — Stock Photo
    Shoulder blood supply
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Healthy colon and skeletal system — Stock Photo
    Healthy colon and skeletal system
    Human kidneys with adrenal glands — Stock Photo
    Human kidneys with adrenal glands
    Human skeletal structure — Stock Photo
    Human skeletal structure
    Alveoli structure and blood supply — Stock Photo
    Alveoli structure and blood supply
    Red blood cells with fibrin — Stock Photo
    Red blood cells with fibrin
    Brain and nerve cell — Stock Photo
    Brain and nerve cell
    Colon of a patient with diverticulitis — Stock Photo
    Colon of a patient with diverticulitis
    Human oesophagus wall — Stock Photo
    Human oesophagus wall
    Male anatomy reference — Stock Photo
    Male anatomy reference
    Human fetus age 19 weeks — Stock Photo
    Human fetus age 19 weeks
    Fertilization showing sperm fertilizing an egg — Stock Photo
    Fertilization showing sperm fertilizing an egg
    Severe osteoarthritis of ankle — Stock Photo
    Severe osteoarthritis of ankle
    Normal X and y chromosomes — Stock Photo
    Normal X and y chromosomes
    Four-cell embryo — Stock Photo
    Four-cell embryo
    Patient with a heart pacemaker — Stock Photo
    Patient with a heart pacemaker
    Cardiovascular system of arm and shoulder — Stock Photo
    Cardiovascular system of arm and shoulder
    Skull with an extradural haematoma — Stock Photo
    Skull with an extradural haematoma
    Human shoulder anatomy — Stock Photo
    Human shoulder anatomy
    Dual chamber pacemaker — Stock Photo
    Dual chamber pacemaker
    Narrowed artery causing atherosclerosis — Stock Photo
    Narrowed artery causing atherosclerosis
    Central nervous system — Stock Photo
    Central nervous system
    X-ray of fractured patella — Stock Photo
    X-ray of fractured patella
    Human sperm cells — Stock Photo
    Human sperm cells
    Healthy extended cervical spine — Stock Photo
    Healthy extended cervical spine
    Fallopian tube cellular structure — Stock Photo
    Fallopian tube cellular structure
    Brain anatomy showing blood supply system — Stock Photo
    Brain anatomy showing blood supply system
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM). — Stock Photo
    Hypodermic needle (26 gauge) and human blood, coloured scanning electron micrograph (SEM).
    Muscles controlling human posture — Stock Photo
    Muscles controlling human posture
    Severe osteoarthritis of ankle — Stock Photo
    Severe osteoarthritis of ankle
    Patient with a heart pacemaker — Stock Photo
    Patient with a heart pacemaker
    Healthy large intestines — Stock Photo
    Healthy large intestines
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Cross-section through a fallopian tube — Stock Photo
    Cross-section through a fallopian tube
    Human jaw bone anatomy — Stock Photo
    Human jaw bone anatomy
    Artery partially blocked by an atheroma — Stock Photo
    Artery partially blocked by an atheroma
    Healthy human teeth — Stock Photo
    Healthy human teeth
    Foreign object in rectum — Stock Photo
    Foreign object in rectum
    Human brain structures — Stock Photo
    Human brain structures
    Shoulder blood supply — Stock Photo
    Shoulder blood supply
    Human brain anatomy showing cortex — Stock Photo
    Human brain anatomy showing cortex
    Red blood cells in the bloodstream — Stock Photo
    Red blood cells in the bloodstream
    Arm bones and pelvic bones — Stock Photo
    Arm bones and pelvic bones
    Normal red blood cells — Stock Photo
    Normal red blood cells
    Fertilization showing sperm fertilizing an egg — Stock Photo
    Fertilization showing sperm fertilizing an egg
    Human fetus age 30 weeks — Stock Photo
    Human fetus age 30 weeks
    Pseudomonas aeruginosa bacteria — Stock Photo
    Pseudomonas aeruginosa bacteria