__SP__ __NODE__ protein in cell culture increases binding of phosphorylated ( Y ) __SP__ __NODE__ protein in fibroblasts from mutant 160.5 day old embryonic __SP__ with a homozygous knockout of __SP__ __NODE__ and __SP__ __NODE__ ( Pik3r ) protein(s) in fibroblasts from mutant 160.5 day old embryonic __SP__ with a homozygous knockout of __SP__ __NODE__ .