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The 5 -end of the duck β A -globin promoter contains a protein binding site BS-3Sp1, the A + T-rich part of which could be involved in DNA bending. Plasmids were constructed using the pBend2 plasmid containingBS-3Sp1 . Circular permutation analysis of the fragments cut out from the plasmids using various restriction endonucleases, in the presence of a partially purified protein extract...