Cytochalasin‐B (CB) induces cells to contract. This contraction is biphasic. The rapid response peaks in 30 minutes and is followed by a slower contraction that leads to the “arborized” configuration. If fully arborized cells are removed from CB and exposed to colcimide they are induced to form twisting, birefringent bands. These bands consist of massive numbers of 100 Å filaments.
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