title: Corrections and clarifications.
abstract: In the Perspective "alpha-Helical coiled coils: More facts and better predictions" by C. Cohen and D. A. D. Parry (28 Jan., p. 488), the second sentence of the second paragraph of column 1 on page 489 should have read, "The structural motif is indeed a left-handed three-helix bundle with left-handed chain connectivity."