Reprinted by permission from Nature: Smith, Douglas E.; Tans, Sander J.; Smith, Steven B.; Grimes, Shelley; Anderson, Dwight L; Bustamante, Carlos. The bacteriophage variant phi29 portal motor can package DNA against a large internal force Nature (London). 413(6857). 18 October, 2001. 748-752. Copyright ©2001 Macmillan Publishers Ltd. http://www.nature.com/
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