Figure 1 | Centrosome structure.   A pair of centrioles is shown, each with ninefold symmetry owing to the nine triplet microtubules. Each centriole has pericentriolar material that nucleates microtubules around the ends closest to one another. Only the maternal centriole has two sets of extra appendages, distal and subdistal; the latter seems to anchor microtubules. A series of interconnecting fibres, different from the pericentriolar material (PCM), links the closest ends of the two centrioles.

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© 2001 Nature Publishing Group