In a cell free system , the affinity of binding of promoter fragment from __SP__ __NODE__ gene consisting of IR1 response element and a protein protein complex consisting of __SP__ __NODE__ and of __SP__ __NODE__ is greater than the affinity of binding of promoter fragment from __SP__ __NODE__ gene consisting of IR1 response element and a protein protein complex consisting of __SP__ __NODE__ and of __SP__ __NODE__ .