Its extracellular domain is composed of four cysteine-rich domains , and the cytoplasmic region contains a death domain known to signal apoptosis .
its extracellular domain is composed of four cysteine-rich domains , and the cytoplasmic region contains a death domain known to signal apoptosis .
O O O O O O O B-protein_domain_or_region I-protein_domain_or_region O O O B-protein_domain_or_region I-protein_domain_or_region O O B-protein_domain_or_region I-protein_domain_or_region O O B-other_name I-other_name O