Abstract
Bundles of microtubular structures appear in the cytoplasm of germinal cells of the African frog Dicroglassus occipitalis. They are made of several associated microtubules. Every bundle contains one normal singlet and numerous arch-shaped microtubular structures growing in all directions from the singlet wall. The walls of these microtubules are shown to contain 10 to 13 protofilaments. Attempts made with colchicine point out their susceptibility to this antimitotic drug. The formation and opening of these microtubular structures give evidence of complex organization.
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