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Vessels of a healthy mini-pig eye. Produced from CT scans and 3D printing, this is a model of the blood vessels of the eye of a miniature pig. A small as 0.02 mm in diameter, the vessels are vital in the delivery of nutrients to muscles which change the size of the pupil, constricting or dilating its size to regulate how much light enters the eye. (Photo by Dr Peter M Maloca/OCTlab/University of Basel and London Moorfields Eye Hospital; Christian Schwaller, Ruslan Hlushchuk/University of Bern and Sébastien Barré/Wellcome Images)
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