Figure 4

The expression of PCNA in the nasal epithelium of pigs at different ages. A Immunofluorescence assessment of PCNA expression in the nasal epithelium. CSII represented the anterior part of the respiratory region, CSIII represented the rear part of the respiratory region, and CSIV represented the olfactory region. Scale bars: 50 μm B Statistical results of PCNA expression. The mean fluorescent intensity of PCNA-positive cells (green) in different parts of the cavity was counted in five random fields (×20) from the four cross-sections. All data shown are the mean ± SD from three independent experiments. Statistical significance was obtained using one-way ANOVA. NS no significance, *P < 0.05, **P < 0.01.