The polymerization of globular actin to fibrous actin which occurs when sperm are activated, was not inhibited by cytochalasin-B. The acrosomal filament and its component actin filaments formed in the presence of cytochalasin-B; and once formed, the actin filaments did not depolymerize when exposed to cytochalasin-B.
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Sanger et al. (1975) studied this question.
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