The transgene consisting of the CAG promoter, LSL (LoxP-STOP-LoxP) cassette, Bcl11b cDNA, and IRES-lynmRFP sequence, in which the LSL cassette is excised in the presence of Cre recombinase to induce the expression of Bcl11b and a fluorescent marker lynmRFP. The line 9 was used for study. (J:278080)