Tg(Myh11-cre/ESR1)1Soff MGI:3819268 syntenic O Transgene transgene Tg(Myh11-cre/ERT2)1Soff transgene insertion 1, Stefan Offermanns SMMHC-CreER<T2> http://identifiers.org/mgd/MGI:3819268 Tg(Myh11-cre/ESR1)1Soff|SMMHC-CreER<T2>