Correction: copy numbers of HIV-1 RNA

In Barbara J. Culliton's article "Gore Tex organoids and organoids and genetic drugs" (News & Comment, 10 Nov., p. 747), it should have been noted that the structural analysis of the implant connections, induding the micrographs shown on page 747, were performed by Christian C. Haudenschild at the Mallory Institute of Pathology, Boston University of Medicine, Boston, MA. His name should have been listed in the photo credit. The legend for the bottom photomicrograph should have read, "Below, a view in cross section confirms the presence of abundant vessels lined with endothelial cells and surrounded by several layers of smooth musclc cells. Two profiles without lumen resemble neural structures, but their precise identity remains to be investigated."