In a cell free system , binding of a DNA fragment ( AGGGAAGGAAGGTCAAAGGCCACTGGTGACAC ) containing a PPRE from __SP__ __NODE__ gene and __SP__ __NODE__ protein and __NODE__ protein is greater than binding of a DNA fragment ( GAGATTATCTGAGGTGAAGGGGCAACCTGTGG ) containing a PPRE from __SP__ __NODE__ gene and __SP__ __NODE__ protein and __NODE__ protein .