Erratum.
In the Research News article "Taking a closer look at AIDS virus relatives" by Jean L. Marx (19 June, p. 1523), Beatrice Hahn was incorrectly identified as a member of the Gallo-Wong-Staal group. Although Hahn collaborates with Gallo and Wong-Staal of the National Cancer Institute, she is in the Department of Medicine of the University of Alabama at Birmingham.