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Nature 432, 454-455 (25 November 2004) | doi:10.1038/432454a; Published online 24 November 2004
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Evolutionary biology: Light on ancient photoreceptors
Thurston Lacalli1
Abstract
Early multicellular organisms had two distinct types of photoreceptor cells, apparently with different functions. How these cells combined to form modern eyes turns out to be a complicated story.
The image-forming eyes, simple eyes (ocelli) and other photoreceptor organs of animals are structurally diverse. But their photoreceptor cells are basically of two types only — either 'ciliary' or 'rhabdomeric', depending on whether they use cilia or arrays of microvilli for light reception (Fig. 1
- Thurston Lacalli is at the Department of Biology, University of Victoria, Victoria, British Columbia V8W 3N5, Canada.
Email: lacalli@uvic.ca
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