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In the print version of this article and the version initially published online, information about the dataset was missing. The complete dataset can be viewed and queried online at http://mouse.bio.brandeis.edu. The dataset has also been deposited in the Gene Expression Omnibus (http://www.ncbi.nlm.nih.gov/projects/geo/index.cgi with accession number GSE2882). The error has been corrected in the HTML and PDF versions of the article. This correction has been appended to the PDF version.