1>BS1-fragment 7fab light chain variable region 2TISCTGSSSNIGAGNHVKWYQQLPG 3>BS2-fragment 2fb4 light chain variable region 4VTISCTGTSSNIGSITVNWYQQLPG 5>BS3-fragment 2fb4 heavy chain variable region 6LRLSCSSSGFIFSSYAMYWVRQAPG 7>BS4-fragment 7fab heavy chain variable region 8LSLTCTVSGTSFDDYYSTWVRQPPG 9 10