Immunogen sequence: LLQPPPAKLL PEHAQTLEKY SWEAFDSHGQ ESSGQLPEEL FLLLQSLVMA THEKDTEAIK SLQVEMWPLL TAEQNHLLHL VLQETISPSG QGV Highest antigen sequence identity to the following orthologs: Mouse - 92%, Rat - 95%. Huntington's disease is caused by an expanded