The transgene consists of a mouse Pcp2 promoter and a human mutant SCA1 cDNA sequence with 82 CAG repeats. The 835 bp fragment of mouse Pcp2 regulatory sequence include exon 1, intron 1, and part of exon 2 of Pcp2. The Pcp2 promoter targets transgene expression to Purkinje cells. Line R2 was generated. (J:261279)