The region around the centriole of the sea urchin egg was ob served with electron microscopy at prophase, metaphase and anaphase. Many electron-dense clusters surrounded the centriole from prophase throughanaphase. They consisted of granules with diameters from 60 to 100 nm. Microtubules of asters and spindle were focused on these clusters.
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Sachiko Endo (1979) studied this question.
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