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The G5 string in the G1HE is required for complete Gata1-HRD activity in fetal liver of transgenic mouse. A, structures of the reporter constructs, number of founders, and number of LacZ-positive embryos in the transgenic mouse reporter assays. The expression of the reporter gene was examined by X-gal staining of fetal liver at E14.5. B, representative X-gal staining of fetal liver prepared from IE3.9intLacZ and IE3.9intG4LacZ transgenic embryos.
