The transgene contains the 179Mb 129Sv-derived 149m19 (accession #AF131205) mouse bacterial artificial chromosome (BAC) containing Serf1, Smn1, Naip2, and Naip5 genes, a choramphenical resistance gene (from pBeloBAC vector) and SP6 and T7 sequence. Line M141 was generated. (J:175888)