This transgene contains the coding sequence for Cre recombinase, followed by a polyadenylation signal to terminate the fusion transcript immediately after the recombinase gene, inserted into the mouse genomic bacterial artificial chromosome (BAC) RP24-190K9 at the ATG transcription initiation codon of the cyclin M2 gene so that expression of the recombinase is driven by the regulatory sequences of the mouse gene. (J:100256)