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News Physiol Sci 19: 133-137, 2004; doi:10.1152/nips.01517.2004 Free Article
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News in Physiological Sciences, Vol. 19, No. 3, 133-137, June 2004
© 2004 Int. Union Physiol. Sci./Am. Physiol. Soc.

"Vision" in Single-Celled Algae

Suneel Kateriya1, Georg Nagel2, Ernst Bamberg2 and Peter Hegemann1

1 Institut für Biochemie, Universität Regensburg, 93040 Regensburg; and
2 Max-Planck-Institut für Biophysik, 60439 Frankfurt am Main, Germany
Photosynthetic unicellular algae have a unique visual system. In Chlamydomonas reinhardtii, the pigmented eye comprises the optical system and at least five different rhodopsin photoreceptors. Two of them, the channelrhodopsins, are rhodopsin-ion channel hybrids switched between closed and open states by photoisomerization of the attached retinal chromophore. They promise to become a useful tool for noninvasive control of membrane potential and intracellular ion concentrations.




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