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) RP23-177E2 at the ATG transcription initiation codon of the lymphocyte antigen 6 complex, locus K gene (Ly6k; formerly 2410015A16Rik) so that expression of the reporter mRNA/protein is driven by the regulatory sequences of the mouse gene. (J:100256)