These mice carry loxP sites flanking exon 4 of Havcr2 gene. When crossed with a Cre recombinase-expressing strain, this strain is useful in eliminating tissue-specific conditional expression of Havcr2 gene.While Havcr2-Flox(Stock No.NM-CKO-205070) mice carrying the loxP sites flanking exon 1-2 of Havcr2 gene. (J:238766)