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Representative sections of lingual epithelium from indicated mouse genotypes stained with anti-pRb antibody (left panel), anti-p107 antibody (middle panel) and anti-p130 antibody (right panel). Examples of strongly positive-stained cells are indicated by black arrows. Brown, positive staining; blue, hematoxylin counterstain. Magnification, x40; scale bar, 200 μm.
