Attachment sites and interconnections of the microtubular system in pigment-containing epidermal cells of Carausius morosus (Insecta,Phasmida) |
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Authors: | Gesa Berthold |
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Affiliation: | (1) Zentrum für Zahnheilkunde, Universität Giessen, Schlangenzahl 14, D-6300 Giessen, Federal Republic of Germany |
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Abstract: | Summary The apical plasma membranes of epidermal cells in the stick insect Carausius morosus Brunner, 1908 forms deep invaginations, the inner surfaces of which are covered with a zone of fine filamentous, electron-dense material. These and similar electron-dense zones, forming circumscribed areas of the basal membrane, are for the attachment of microtubules. These structures may be microtubuleintiating sites, where microtubules start to polymerize. Microtubules have sidearms that project freely or are attached to the stem, to sidearms of other microtubules or to filaments 4–6 nm in diameter and to a fine filamentous electron-dense meshwork. Their attachment to the apical and basal plasma membranes and to each other make them a firmly anchored cytoskeleton, an important prerequisite for pigment movement. |
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