The line was obtained by microinjection of a circular murine BAC transgene (RP23-209C6) previously modified by recombineering at the ATG of the Lck gene of a rabbit-beta-globin intron-cre/ERT2 cassette followed by a flipped PGK-Tn5-Kana/NeoR cassette. The subline 51.17 was analyzed and cryopreserved. (J:82809)