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Genomic organization of ultraconserved sequences associated with HoxD cluster: The ultraconserved region downstream of Evx2 consists of three blocks of conserved sequences CR1, CR2, and CR3 spanning to 5.0 kb in mouse (GRCm38/MM10, chr2: 74,649,244–74,654,293) and 3.6 kb in zebrafish (Zv9/DanRer7, chr9: 1,996,709–2,000,392). The size of the three blocks differ slightly in mouse CR1 (315 bp), CR2 (800 bp), and CR3 (260 bp) and zebrafish CR1 (300 bp), CR2 (760 bp), and CR3 (250 bp).
