The HSA-SMN transgene was designed with the human alpha-skeletal actin (HSA or ACTA1) promoter region, splice acceptor site from the SV40 VP1 intron, full-length humsn SMN cDNA (containing exons 1-8), and two SV40 polyA signals. Mice from founder line 69 (HSA69-SMN) were found to have 11 copies of the transgene. (J:97103, J:131663)