Abstract
The elongation of microvilli, which normally occurs upon fertilization in sea urchin eggs, was also observed in unfertilized eggs treated with the enzyme, papain. Cortical granule exocytosis, which is thought to be the source of membrane used in microvillar elongation, does not occur in the papain-treated eggs. It appears, therefore, that there is more than one way in which the egg plasma membrane can increase very quickly and to a great extent. In addition, the kinds of microvilli formed in the two instances appear to be different. Previous work with reaggregating sea urchin cells is also cited to support the suggestion that microvilli can form in different ways and are of different types.
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