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Theβ-gal gene is selectively expressed in NPY cells. A, Retinal section from a transgenic mouse that expresses β-gal under the regulation of the NPY gene promoter. The section was fixed and stained with a histochemical marker for β-gal, X-gal, which produces a blue product in the β-gal-expressing cells. B, Same section stained with an antibody to NPY, using a rhodamine red-X fluorescent secondary antibody. C, Control section stained only with the secondary antibody. Scale bar, 20 μm.
