MGI:3623490 Transgene O Tg(Igbp1-cre)1Imku alpha4-b-cre<Tg> Tg(Igbp1-cre)1Imku|alpha4-b-cre<Tg> http://identifiers.org/mgd/MGI:3623490 transgene insertion 1, Nobuo Sakaguchi Tg(Igbp1b-cre)1Imku transgene