alpha in the first NH2-terminal 29 residues and contains an additional region of 142 residues at the COOH terminus .
alpha in the first nh2-terminal 29 residues and contains an additional region of 142 residues at the cooh terminus .
O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O O 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