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Dietary nitrate facilitates the proliferation of intestinal epiyhelial cells in aging mice. a, b Immunofluorescence staining of PCNA (green) and DAPI (blue) in the colonic tissues in different groups. Scale bar: 50 μm. Data were shown as mean ± SD (n = 5). ***Indicates significance at P < 0.001, **P < 0.01, *P < 0.05, ns no significant
