Tg(Gpa33-rtTAS*M2)2Lud

The M2rtTA tet transactivator is expressed in the epithelium of the intestine and colon under the control of the intestine-specific A33 promoter. The expression/activety of the transactivator is mosaic, most likely due to stochastic transgene silencing. Approximately 1 to 5 crypts in the proximal small intestine express the transgene, fewer in the distal intestine and colon. (J:104190)