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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/117241359 Title: Ultrastructural analysis of iridophore organellogenesis in a lizard, Sceloporus graciosus (Reptilia: Phrynosomatidae). Publisher: ISBN/ISSN: 0362-2525 OCLC:117241359

  
  

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Ultrastructural analysis of iridophore organellogenesis in a lizard, Sceloporus graciosus (Reptilia: Phrynosomatidae).

Author:	RL Morrison; SK Frost-Mason
Edition/Format:	Article : English
Publication:	Journal of morphology, 1991 Aug; 209(2): 229-39
Database:	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Summary:	Transmission electron microscopy (TEM) data from the ultrastructure of lizard skin iridophores (reflective dermal chromatophores) are used to illustrate the organellogenesis of small rectangular reflecting platelets, which are the color-generating components of these cells. During the development of reflecting platelets, crystals are deposited within double-membraned vesicles from electron-dense material located within the vesicles. The crystals are initially small but expanded lengthwise eventually to fill the vesicle that contains them. The inner membrane then tightly surrounds the crystal whereas the outer membrane is much more loosely associated with the inner-membrane-bound crystal. These observations allow discussion of the possible origin of the precursor double-membraned vesicles from endoplasmic reticulum (ER) and Golgi-derived vesicles. A model is proposed that incorporates our findings and other published reports to explain the origin of the precursor double-membraned vesicles via three alternative pathways.  Read more...
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