Doctor performing a colonoscopy using an endoscope, which is a flexible camera through which internal cavities can be viewed. This technique is routin

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Doctor performing a colonoscopy using an endoscope, which is a flexible camera through which internal cavities can be viewed. This technique is routinely used in the diagnosis of cancer and ulcers.

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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