In a system of purified components , binding of a protein chimera composed of a protein fragment containing a carboxy terminal domain from __SP__ __NODE__ protein and of a protein fragment containing a central domain and a N terminal domain from __SP__ __NODE__ protein and __SP__ __NODE__ protein is greater than binding of a protein chimera composed of a protein fragment containing a carboxy terminal domain from __SP__ __NODE__ protein and of a protein fragment containing a central domain and a N terminal domain from __SP__ __NODE__ protein and __SP__ __NODE__ protein .