An inhibitor of microtubule assembly has been identified and partially purified from microtubule-depleted brain extracts from day-old chicks and 4-month-old calf. This inhibitor suppresses the self-nucleation of microtubules in vitro with minimal effect upon the final extent of assembly. It may have a developmental role in vivo as it is not detected in adult brain from either cattle or rabbit.
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Surridge et al. (1991) studied this question.