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Results of double-staining of p16INK4A and Ki67. Immunofluorescence double-staining of p16INK4A (red) and Ki67 (green) in samples from a donor younger than 30 years of age (A, C, and E) and from a donor older than 50 years of age (B, D, and F). Panels G and H represent DAPI staining.
