Patent ID: 7754209

Claim:
A fusion protein that binds CD20 comprising an amino acid sequence as set forth in: SEQ ID NO:135 (2H7 scFv (CSS-S)H WCH2 WCH3), wherein proline at position 283 is substituted with serine; SEQ ID NO:137 (2H7 scFv (SCS-S)H WCH2 WCH3), wherein proline at position 283 is substituted with serine; SEQ ID NO:166 (2H7 scFv (CSC-S)H WCH2 WCH3), wherein proline at position 283 is substituted with serine; SEQ ID NO:372 (2H7 scFv VHL11S (CSS-S)H WCH2 WCH3); SEQ ID NO:246 (2H7 scFv VH L11S (CSC-S)H WCH2 WCH3); SEQ ID NO:370 (2H7 scFv VH L11S (SSS-S)H WCH2 WCH3); SEQ ID NO:268 (2H7 scFv VH L11S (CSS-S)H K322S CH2 WCH3); or SEQ ID NO:276 (2H7 scFv VH L11S (CSS-S)H P331S CH2 WCH3).