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Healthy skull. Frontal X-ray of a healthy skull.

Rib cage. Coloured three-dimensional computed tomography (CT) scan of a posterior view of a healthy rib cage and heart.

Tinnitus, conceptual computer artwork.

Nerve synapses, computer artwork.

Cancer cell dividing. Coloured scanning electron micrograph (SEM) of a colorectal cancer cell dividing. It is in late telophase. M... Credit: Science Photo Library

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Normal shoulder. Coloured X-ray of the shoulder of a 19 year old man.

Normal arteries. 3D computed tomography (CT) scan of the arteries supplying the brain of a 38 year old.

Normal heart. 3D computed tomography (CT) scan of a healthy heart from a 58 year old male.

Normal knees. Coloured frontal X-ray of the flexed knees of a 24 year old patient.

DNA, computer artwork. DNA (deoxyribonucleic acid) consists of two strands (blue) of sugar phosphates forming a double helix. Stre... Credit: Science Photo Library

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Four adult teeth. Transparent cross sections with arteries (red), veins (purple) and nerves (green). Computer artwork.

High cholesterol levels. Computer artwork of balls of cholesterol. When there are high levels of low density lipoprotein (LDL) cho... Credit: Science Photo Library

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The trabeculae of spongy bone within the bones of individuals with osteoporosis.

Influenza virus particles, coloured transmission electron micrograph (TEM). The virus consists of ribonucleic acid (RNA), surround... Credit: Science Photo Library

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Blood cells. Coloured scanning electron micrograph (SEM) of two erythrocytes (red blood cells) and a granulocyte (white). Granuloc... Credit: Science Photo Library

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Lung lining. Coloured scanning electron micrograph (SEM) of a section through epithelial cells of the bronchus (lung airway). The ... Credit: Science Photo Library

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Artwork of the anatomy of the eye showing the coloured iris, central pupil and lens (white), the inner retina (pink) with blood ve... Credit: Science Photo Library

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Alveolar macrophage. Coloured scanning electron micrograph (SEM) of an alveolar macrophage (grey, centre right) in lung tissue. Ma... Credit: Science Photo Library

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Q fever bacteria. Coloured scanning electron micrograph (SEM) of Q fever bacteria (Coxiella burnetii, green) infecting a monocyte ... Credit: Science Photo Library

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Human foetus in the womb, computer artwork. This foetus is at full term, and is ready to be born. It is surrounded by amniotic flu... Credit: Science Photo Library

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Human foetus in the womb, computer artwork. This foetus is at full term, and is ready to be born. It is surrounded by amniotic flu... Credit: Science Photo Library

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Dividing HeLa cells. Coloured scanning electron micrograph (SEM) of HeLa cells undergoing cytokinesis (cell division). Cytokinesis... Credit: Science Photo Library

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Skin cancer cells. Coloured scanning electron micrograph (SEM) of melanoma cancer cells. This cancer arises from the skin's melano... Credit: Science Photo Library

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Melanoma cancer. Coloured transmission electron micrograph (TEM) of a section through human skin showing melanoma cancer cells (sm... Credit: Science Photo Library

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MODEL RELEASED. Malignant (cancerous) melanoma on the waist of a 47 year old woman. A malignant melanoma is a type of skin cancer ... Credit: Science Photo Library

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