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β-Galactosidase expression in kidneys or transgenic mice. Kidney from a wild-type mouse (A), from a 1-week salt-depleted mouse (B), and from a 2-kidney, 1-clip treated mouse (C) were cut into two parts and stained in toto with X-gal. β-Galactosidase activity (blue staining) is seen in the inner face of the cut kidney and is labeled by arrows. Scale bar, 1 mm.
