An EGFP-IRES-creERT2 cassette was inserted at the translational start site of the gene along with a loxP-flanked neomycin cassette. The neomycin gene was then excised in vivo by crossing with a cre-deleter strain. EGFP expression is driven by the endogenous promoter. Cre expression is induced in Smoc2 expressing cells by tamoxifen treatment. (J:186432)