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DNA chains with the different arrangements of sequence elements examined in this article: Arrangement A, no insulatorlike elements; Arrangement B-1, insulatorlike elements at almost the same positions as in the Ameres et al. experiment (15); Arrangement B-2, insulatorlike elements more widely separated than in the Ameres et al. experiment (15); Arrangement B-3, shorter insulatorlike elements; and Arrangement C, tandemly arranged insulatorlike elements.
