In cell free system , the affinity of binding of a DNA fragment ( AAGGGTGGGGGTGGGGC 1071 1055 ) containing a GT box 1 2 from __SP__ __NODE__ gene and a heterodimeric protein protein complex consisting of __SP__ __NODE__ and of __SP__ __NODE__ is greater than the affinity of binding of a DNA fragment ( AAGGGTGGGGGTGGGGC 1071 1055 ) containing a GT box 1 2 from __SP__ __NODE__ gene and homodimeric __SP__ __NODE__ protein .