Erratum for vol. 94, p. 3178

Regarding the article by Kaufman et al, entitled “Transgenic Analysis of a 100-kb Human β-Globin Cluster–Containing DNA Fragment Propagated as a Bacterial Artificial Chromosome,” which appeared in the November 1, 1999, issue of Blood (Volume 94:3178-3184), a correction should be noted. In “Materials and Methods,” the authors stated that “the P1-derived artificial chromosomes (PAC) clone designated 4396 was isolated from a commercial library (Genome Systems, St Louis, MO). . . . .” Although the human PAC library was screened at Genome Systems, the library was in fact prepared by Drs Panos Ioannou and Pieter de Jong. The authors were not aware that Drs Panos Ioannou and Pieter de Jong created this library.