Correction

Abstract

BIOPHYSICS. For the article ‘‘On structural transitions, thermodynamic equilibrium, and the phase diagram of DNA and RNA duplexes under torque and tension,’’ by Jeff Wereszczynski and Ioan Andricioaei, which appeared in issue 44, October 31, 2006, of Proc Natl Acad Sci USA (103:16200–16205; first published October 23, 2006; 10.1073 pnas.0603850103), the authors note that, due to a printer’s error, refs. 40, 44, 45, 48, and 50 appeared incorrectly because of a transposition. Also, ref. 56 should have been listed, and cited in text, as ref. 55. The online version has been corrected. The corrected references appear below.