A CD20-binding polypeptide composition comprising a combination of a modified heavy chain variable region polypeptide and a modified light chain variable region polypeptide. The combination can be (a) a modified 2B8 antibody heavy chain variable region polypeptide of SEQ ID NO: 48; and a modified 2B8...http://www.google.es/patents/US8147832?utm_source=gb-gplus-sharePatente US8147832 - CD20-binding polypeptide compositions and methods
