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X-Gal staining shows the absence of nrf1lacZ/lacZ ES cells in the hepatic parenchyma of adult chimeric mice. (a and b) Whole-mount X-Gal staining of livers from two representative adult mice, both of which have extensive chimerism determined from coat color and X-Gal staining of other tissues. Note the absence of blue staining in the hepatic parenchyma. (c) Gall bladder showing intense blue staining.
