Immunogen sequence: CDGTANTFRV MFKEPIEILP NVCYTACATL KGPDSHYGTK GLKKVVHETP AASKTVFFFF SSPGNNNGTS IEDGQIPEII FYT. The C-terminus of BTBD1 binds topoisomerase I. The N-terminus contains a proline-rich region and a BTB/POZ domain (broad-complex, Tramtrack a