This transgene contains the coding sequence for enhanced green fluorescent protein (EGFP), followed by a polyadenylation signal, inserted into the mouse genomic bacterial artificial chromosome (BAC) RP23-140D18 at the ATG transcription initiation codon of SRY-box containing gene 9 (Sox9) so that expression of the reporter mRNA/protein is driven by the regulatory sequences of the mouse gene. (J:100256)