Cover illustration
May 15, 2007; 104 (20)
Cover image: Müller glial cells act as living optical fibers, transporting light through the inverted retina of vertebrates. With their funnel-shaped endfeet, Müller cells collect light at the retinal surface and guide it to photoreceptor cells on the opposite side. Images are thus transmitted through optically distorting tissue. See the article by Franze et al. on pages 8287–8292. Image courtesy of Jens Grosche.
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