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Remarks on the role of microtubules in enucleating normoblasts.

In enucleating normoblasts single microtubules are often arranged in a perinuclear position. Sometimes it seems that microtubules attach at the nucleus membrane. Also bundles of microtubules can be found, but a subplasmalemmal microtubular "hoop" does not exist. Colchicine does not influence the process of enucleation. It is concluded that microtubules do not participate in the expulsion of the nucleus during enucleation.