- Correspondence to Gary D Wu, 915 BRB II/III, 421 Curie Blvd, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104; James D Lewis, 720 Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104-6021; Frederic D Bushman, 426 Johnson Pavilion, Department of Microbiology, 3610 Hamilton Walk, Philadelphia, PA 19104-6076;
- Received August 6, 2014
- Revised October 28, 2014
- Accepted October 29, 2014
- First published November 26, 2014.
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