Fas ( CD95/APO-1 ) is a transmembrane protein of the TNF/neuron growth factor receptor family .
fas ( cd95/apo-1 ) is a transmembrane protein of the tnf/neuron growth factor receptor family .
B-protein_molecule O B-protein_molecule O O O B-protein_family_or_group I-protein_family_or_group O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O