These mice carry loxP sites flanking exon 2-3 of Myc gene. When crossed with a Cre recombinase-expressing strain, this strain is useful in eliminating tissue-specific conditional expression of Myc gene.While Myc-Flox(2)(Stock No.NM-CKO-215077) mice carrying the loxP sites flanking exon 2 of Myc gene. (J:238766)