*Departments of Ophthalmology, Pediatrics, and Neurobiology and Anatomy, Moran Eye Center, University of Utah, Salt Lake City, UT; and †Departments of Ophthalmology and Visual Sciences, Cell and Developmental Biology, Physiology and Molecular Biophysics, Vanderbilt University School of Medicine, Nashville, TN.
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Hartnett et al. (2013) studied this question.
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