Correction for Kues et al., Genome-wide expression profiling reveals distinct clusters of transcriptional regulation during bovine preimplantation development in vivo

PERSPECTIVE Correction for ‘‘Chemical Ecology Special Feature: The evolution of gene collectives: How natural selection drives chemical innovation,’’ by Michael A. Fischbach, Christopher T. Walsh, and Jon Clardy, which appeared in issue 12, March 25, 2008, of Proc Natl Acad Sci USA (105:4601–4608; first published January 23, 2008; 10.1073 pnas.0709132105). The authors note that a reference was inadvertently omitted from their article. On page 4607, right column, in Conclusion: How Do New Gene Clusters Form?, line 17, the reference callout ‘‘(109–111)’’ should instead read ‘‘(109–111, 113).’’ The added reference appears below.