Ultrastructural observations on changes in cell shape in chromatophores of the sea urchin Centrostephanus longispinus |
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Authors: | Prof. W. Weber H. Gras |
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Affiliation: | (1) Zoologisches Institut der Universität, II. Lehrstuhl, Weyertal 119, D-5000 Köln 41, Germany |
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Abstract: | Summary Alterations in cell shape of the light-sensitive chromatophores of the sea urchin Centrostephanus longispinus were studied by scanning- and transmission electron microscopy. Transition of the aggregated to the dispersed state is accompanied by incorporation of vesicles into the membrane of the pigment cell. During dispersion a system of microtubules originating from centriole-like structures is established throughout the stellate cell. Within restricted areas of the cell, cytoplasmic differentiation and condensation is found. The possible functional significance of the findings is briefly discussed. |
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Keywords: | Chromatophores Light-sensitivity Alteration in cell shape Microtubules Echinoids |
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