A protein chimera composed of a protein fragment from __NODE__ receptor protein(s) and of a protein fragment from __NODE__ protein in 4 hydroxytamoxifen treated , serum deprived fibroblasts from mutant embryonic __SP__ ( __SP__ ) with a copy of mutant __SP__ __NODE__ ( allele __NODE__ ) and a copy of mutant __SP__ __NODE__ ( allele __NODE__ ) causes little or no change in apoptosis of 4 hydroxytamoxifen treated , serum deprived fibroblasts from mutant embryonic __SP__ ( __SP__ ) with a copy of mutant __SP__ __NODE__ ( allele __NODE__ ) and a copy of mutant __SP__ __NODE__ ( allele __NODE__ ) .