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Light in womb 'gives healthy eyes' - in mice
http://www.bbc.co.uk/news/health-21040254***SNIP
Light or dark?
If you could journey inside a mouse or a person, there would not be enough light to see. However, tiny quantities of light do pass through the body.
This effect has already been used to film an infection spreading through the body.
Now scientists - at the University of California, San Francisco, and Cincinnati Children's Hospital Medical Center - believe that body-penetrating light can alter the development of the eye, at least in mice.