The construct containing FMS-like forkhead box P3 (Foxp3) driving Red Fluorescent Protein (RFP) and cre/ERT2 fusion gene was used to create transgenic line in C57BL/6 mouse. RFP is expressed in CD4+CD25+ cells. Cre recombinase is expressed in skull, lung, ovary, brown fat, and inguinal lymph node. (J:202955)