Dr Page said the laboratory had a number of sophisticated microscopes which will be available to Pauline including a confocal laser scanner, which is a microscope which uses a laser to illuminate and fluoresce.

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The resulting laser-fiber-microscope combo can spot such 1-in-10 million traveling cancer cells in 30 minutes.

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Also, such lasers can scan a much broader field of view than a laser in a digital microscope.

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Recording the blips also requires sending this gathered-up light through microscope lenses to filter out rival light from the laser itself.

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