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Lack of detectable expression of endogenous pdx1 in the mouse hindbrain. Section from the r1 region of a pdx1-creCre/0; ZegGFP/0 embryo, immunostained for GFP (A) and Pdx1 (B) using TSA amplification. No detectable expression of Pdx1 was observed, despite robust expression of GFP. Scale bars, 100 μm.
