Soifer (1986):

When microtubules are required by a cell for a particular function, microtubules assemble in the appropriate part of the cell, with the necessary orientation. As microtubules are no longer needed, they depolymerize.

Essential functions within living cells ranging from single cell amoeba and paramecium to neurons within earthworms and Nobel scholars are performed by similar cytoskeletal structures. The most visible and widely studied cytoskeletal elements are microtubules (MT), slender cylinders intimately involved in important cell functions. As DNA is the common genetic data base containing hereditary information, microtubules are real time executives of dynamic activities within living cells.

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