Transgene MGI:2176163 MMTV-Cre http://identifiers.org/mgd/MGI:2176163 transgene insertion 4, Lothar Hennighausen Tg(MMTV-cre)4Mam CreD O D-line|MMTV-CreD|MMTV-Cre|CreD transgene MMTV-CreD D-line