By using recombineering bacterial strain, the transgene with cre/ERT2 was inserted into a bacterial artificial chromosome (BAC: RP23 332E15) containing the mouse Lyve1 promoter and gene. Three strains transmitted the transgene in the germline after crossing with C57BL/6. Line numbers were not indicated. The pound symbol (#) is used when no line is specified and/or lines are pooled. (J:309509)