Abstract:

Using a combination of electron microscopic cytochemistry, stereology and experiments with inhibitors, the structure, chemistry, distribution and function of nuclear invaginations characteristic of gymnosperm microspores have been studied. These structures now emerge as specialized ingrowths of the post-meiotic nuclear envelope, rather than as modified nuclear pores as had previously been suspected. The invaginations possess two principal components, a membranous cylinder which abuts onto the...

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