Published Online:13 Oct 2017https://doi.org/10.1187/cbe.03-06-0024
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Downloads: 49
Submitted: 3 June 2003
Revised: 30 June 2003
Accepted: 14 July 2003
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© 2003 by The American Society for Cell Biology
I thank Bruce Alberts, Robert DeHaan, and Suzanne Woolsey for contributing information and carefully reading and commenting on early drafts of the manuscript.
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