In a cell free system , binding of __NODE__ response element from __SP__ __NODE__ gene and a heterodimeric protein protein complex consisting of mutant __SP__ __NODE__ ( N terminal truncation 1 90 ) and of __SP__ __NODE__ is greater than binding of __NODE__ response element from __SP__ __NODE__ gene and a heterodimeric protein protein complex consisting of mutant __SP__ __NODE__ ( C terminal truncation 448 End with its H helix 11 12 deleted N terminal truncation 1 90 ) and of __SP__ __NODE__ .