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Two errors of gene annotation have come to our attention. Although we refer to Zfp36 in the text, the gene identified in our data sets was Zfp36l-1 (Zfp36-like 1; NCBI RefSeq accession number NM_007564). Current evidence suggests that Zfp36l-1 protein and its close relatives are RNA-binding factors rather than transcription factors1,2,3. Rather than Thra (thyroid hormone receptor-α), which we identified on the basis of an incorrect Unigene cluster assignment in NCBI, the correct assignment is the nuclear orphan receptor Rev-erb-β (GenBank accession number U09504). These corrections do not affect our conclusions in any significant way.