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Aizenberg, J., Tkachenko, A., Weiner, S., Addadi, L., & Hendler, G. (August 23, 2001). Calcitic microlenses as part of the photoreceptor system in brittlestars. Nature, 412(6849), 819-23.
Arendt, D., Tessmar-Raible, K., Snyman, H., Dorresteijn, A W, & Wittbrodt, J. (Oct 29, 2004). Ciliary photoreceptors with a vertebrate-type opsin in an invertebrate brain. Science, 306(5697), 869-72.
Piatigorsky, J (April 2006). Seeing the light: The role of inherited developmental cascades in the origins of vertebrate lenses and their crystallins. Heredity, 96(4), 275-7.
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