Handedness: basic physics.

In the News & Comment article "Genetic testing set for takeoff" by Rachel Nowak (22 July, p. 464), Michael Liskay of Oregon Health Sciences University in Portland should have been named as the senior scientist on one of the teams that identified MLH1. The test for Charcot-Marie-Tooth disease detects the duplication of the PMP22 gene, not a deletion, as stated in the table accompanying the article (p. 466).