Summary
An electron microscope study of a variety of invertebrate and vertebrate cell types has supported the postulate that the microtubule is a universal cellular organelle. Microtubules of similar dimensions have been observed in the flagellum and beneath the plasma membrane of Trypanosoma lewisi, in the flagellum, manchette and mitotic spindle of the earthworm (Lumbricus terrestris) spermatid; and in fibroblasts, proximal convoluted and collecting tubule cells of the hypertrophying rat kidney. The specific occurrence and organization of the microtubules in cells undergoing morphological and developmental changes have suggested that these organelles are contractile and that they effectively contribute to the maintenance of cellular form. The possibility that microtubules may function as an intracellular transport system is also suggested.
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This work was supported by grants CA-04046, GM-08380, and K 3-AM-4932 from the U. S. Public Health Service.
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Anderson, W.A., Weissman, A. & Ellis, R.A. A comparative study of microtubules in some vertebrate and invertebrate cells. Zeitschrift für Zellforschung 71, 1–13 (1966). https://doi.org/10.1007/BF00339826
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DOI: https://doi.org/10.1007/BF00339826