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retina
This is a review of the experimental studies on the vertebrate retina neurogenesis.
      
At the early stages of retina development, the neuroepithelial cells divide synchronously, thus leading to the accumulation of a certain number of the retinal rudiment cells.
      
The proliferating multipotent cells are preserved in the ciliary-terminal zone of the retina of amphibians, fish, and chickens during their entire life.
      
An Immunohistochemical Study of Localization of the Calcium-Binding Protein Recoverin in Retina of the Newt Pleurodeles waltl
      
The presence and localization of the calcium-binding protein recoverin, initially found in photoreceptors of the bovine eye, were immunochemically studied in retina of the new Pleurodeles waltl.
      
A protein with an apparent molecular mass of 26 kDa was found in the retina extract, which was specifically stained by the antibodies against recoverin.
      
Localization of recoverin was studied on the retina sections: an intense reaction was found in the inner segments and a weak reaction was found in the basal part of the outer segments of photoreceptors and in Landolt's clubs of displaced bipolars.
      
The data obtained open a possibility of using recoverin as a marker protein of photoreceptors and displaced bipolars in studies of retina regeneration in newts.
      
Expression of Regulatory Homeobox Genes during Retina Regeneration in Adult Newts
      
We studied molecular-genetic mechanisms of retina regeneration in amphibians and, specifically, expression of the homeobox genes Pax6, Prox1, and Six3 in normal development and during retina regeneration in the newt.
      
A comparative PCR analysis of expression of Pax6, Prox1, and Six3 was carried out in the native and regenerating newt retina, which allowed estimation of the level of expression.
      
cDNA libraries obtained from the native and regenerating retina were used as templates.
      
The genes we studied were expressed in both native and regenerating retina.
      
The interactions between these and other regulatory genes and localization of their expression in the cells of native and regenerating retina will be studied using in situ hybridization and immunohistochemistry.
      
An Organotypic Culture of the Newt Retina together with Other Tissues of the Posterior Eye Segment as a Model for Studying the E
      
Proliferating cells were also localized in the ciliary marginal zone of the retina in all studied amphibians, particularly, in the axolotl.
      
After retinectomy, the retina is regenerated from the cells of the growth ciliary marginal zone in all amphibians, pigment epithelial cells in the newt, and pigment epithelial cells of the embryonic fissure in the axolotl.
      
We studied tissue-specific expression of homeobox genes Pax6, Prox1, and Six3 during regeneration of the retina and lens.
      
In the native retina, mRNA of Pax6, Prox1, and Six3 was predominantly localized in ganglion cells and in the inner nuclear layer of the retina.
      
During differentiation of the cellular layers in the course of retinal regeneration, Pax6, Prox1, and Six3 mRNA was predominantly localized in ganglion cells and in the inner part of the inner nuclear layer, which was similar to the native retina.
      
 

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