VOLUME 289 (2014) PAGES 23428–23436
This article has been withdrawn by M. C. Sanguinetti and A. Hansen. With the exception of R56Q1/wt3, wt2/R56Q1/wt1, and wt3/R4AR5A1, the tetramers studied in Figs. 2–5 were not properly constructed.
VOLUME 289 (2014) PAGES 23428–23436
This article has been withdrawn by M. C. Sanguinetti and A. Hansen. With the exception of R56Q1/wt3, wt2/R56Q1/wt1, and wt3/R4AR5A1, the tetramers studied in Figs. 2–5 were not properly constructed.