MEDICAL SCIENCES. For the article “The IgG Fc receptor, FcγRIIB, is a target for deregulation by chromosomal translocation in malignant lymphoma” by Mary B. Callanan, Patricia Le Baccon, Pascal Mossuz, Samuel Duley, Christian Bastard, Rifat Hamoudi, Martin J. Dyer, Gustav Klobeck, Ruth Rimokh, Jean Jacques Sotto, and Dominique Leroux, which appeared in number 1, January 4, 2000, of Proc. Natl.

Acad. Sci. USA (97, 309–314), the authors note the following correction. The first subheading in the Results section should read “Southern Blot Analysis and Cloning of the t(1;22)(q22;q11) Breakpoint Junction.”