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      Persistence of Retinal Dopamine Cells in the Degenerated Eye of the Cave Salamander, Proteus anguinus L.

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          Abstract

          The Proteus anguinus L. is a blind cave perennibranch amphibian whose visual system undergoes an important morphogenetic degeneration in adulthood. The eyeball becomes atrophied and disappears under the fat tissue of the head. However, a retina can still be identified and a photophobic behavior of the animal indicates a remaining photosen-sitivity. In the oldest animal observed, some photoreceptor cells are still present as well as other types of retinal neurons. Characteristic synapses are observed in both the inner and outer plexiform layers. Dopaminergic amacrine cells, with processes in the inner plexiform layer, can be identified by their tyrosine-hydroxylase immunoreactivity. Taken together, these results indicate a possible functional role of the remaining retina. Since dopamine is especially involved in light adaptation from darkness, the residual retina could act in triggering the turning behavior of Proteus in response to lightening.

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          Author and article information

          Journal
          ORE
          Ophthalmic Res
          10.1159/issn.0030-3747
          Ophthalmic Research
          S. Karger AG
          0030-3747
          1423-0259
          1987
          1987
          04 December 2009
          : 19
          : 6
          : 309-317
          Affiliations
          aLaboratoire de Neuro-Cytologie Oculaire, INSERM U. 86, Paris; bInstitut de Biologie Physico-Chimique, Paris, et cLaboratoire Souterrain du CNRS, Moulis, France
          Article
          265514 Ophthalmic Res 1987;19:309–317
          10.1159/000265514
          3441352
          © 1987 S. Karger AG, Basel

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          Page count
          Pages: 9
          Categories
          Original Paper

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