In fibroblasts from __SP__ , binding of __SP__ __NODE__ protein and a protein protein complex consisting of mutant __SP__ __NODE__ ( deletion 167 185 R189A ) and of dimyristoylphosphatidylcholine is greater than binding of __SP__ __NODE__ protein and a protein protein complex consisting of mutant __SP__ __NODE__ ( R172A ) and of dimyristoylphosphatidylcholine .