One of these , previously called B1 , is a 97-kDa protein which is secreted in large amounts and has been purified from protein-free , conditioned medium .
one of these , previously called b1 , is a 97-kda protein which is secreted in large amounts and has been purified from protein-free , conditioned medium .
O O O O O O B-protein_molecule O O O B-protein_molecule I-protein_molecule O O O O O O O O O O O B-other_name I-other_name I-other_name I-other_name O