In a cell free system , the affinity of binding of a DNA fragment ( 108 79 ) containing a __NODE__ response element from __SP__ __NODE__ gene(s) and heterodimer consisting of frog __NODE__ and of __NODE__ is the same as the affinity of binding of a DNA fragment ( 108 79 ) containing a __NODE__ response element from __SP__ __NODE__ gene(s) and heterodimer consisting of frog __NODE__ and of __NODE__ .