Abstract
Helical structures so far not known inMicrasterias are observed in the cytoplasm of differentiating cells ofMicrasterias thomasiana which were pretreated by a special fixation procedure. The structures measure about 45 nm in diameter and are situated in the area of the postmitotic nucleus and its surrounding microtubule system, sometimes close to different kinds of vesicle. Nature and function of the helical structures are still obscure; a relationship to microtubules is discussed.
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