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Figure Caption
Fig. 3 Genomic organization of the chicken, human and zebrafish CTCF genes. Filled boxes, protein coding exons; open boxes, untranslated exons; arrows, transcription start sites. The numbers indicate the estimated sizes of exons and introns in kilobases. The eleven zinc fingers of mammalian CTCF are distributed in exons E2 to E8, with several ZFs being split across neighboring exons. Structure of the avian and human CTCF genes is shown according to Ohlsson et al. (2001)
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Reprinted from Gene, 375, Pugacheva, E.M., Kwon, Y.W., Hukriede, N.A., Pack, S., Flanagan, P.T., Ahn, J.C., Park, J.A., Choi, K.S., Kim, K.W., Loukinov, D., Dawid, I.B., and Lobanenkov, V.V., Cloning and characterization of zebrafish CTCF: Developmental expression patterns, regulation of the promoter region, and evolutionary aspects of gene organization, 26-36, Copyright (2006) with permission from Elsevier. Full text @ Gene