Tet-off-eGFPCre BAC transgenic Six2-TGC<tg> Tg(Six2-EGFP/cre)1Amc MGI:3845228 Six2-TGC(tg) Tg(Six2-tTA,tetO-EGFP/cre)1Amc http://identifiers.org/mgd/MGI:3845228 Inducible|Recombinase transgene insertion 1, Andrew P McMahon TGC BAC transgenic allele