In a cell free system , binding of a DNA fragment ( 5 ' AGGGTTCACCGAAAGTTCAGC 3 ' containing a RARE from __NODE__ gene and heterodimer consisting of __NODE__ and of __NODE__ is greater than binding of a DNA fragment ( 5 ' TCAGGTCATGACCTGA 3 ' containing a TREpal motif and heterodimer consisting of __NODE__ and of __NODE__ .