The author is in the Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80309-0347, USA. richard.mcintosh@colorado.edu
Two recent papers characterize a protein complex that is part of the budding yeast kinetochore, the specialization that links chromosomal DNA with one or more spindle microtubules. Both studies present convincing evidence that this complex can assemble into rings or helices that wrap around microtubules.
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