DNase hypersensitivity sites (DHS) from the 3134 mammary tumor cell line [22] were screened to identify potential gene regulatory regions near Arntl2. Two hypersensitivity sites were identified approximately 10 and 12 kb upstream of the predicted transcriptional start site for the Arntl2 Refseq transcripts (S2A Fig). Here, BMAL2 is linked to breast cancer.