Quantification of CD163 positive cells in the lamina propria of the porcine nasal mucosa. A The highlighted area shows where the total number of cells and CD163+ cells were counted. Pictures, 175 µm in-depth, were taken under the nasal epithelium using a ×10 ocular lens and ×63 objective. The upper white line indicates the border between the respiratory epithelium and the lamina propria. B Percentage of CD163+ cells from different parts of the nasal tissues: (I) anterior nasal septum, (II) posterior nasal septum, (III) medial side of the dorsal nasal turbinate, (IV) lateral side of the dorsal nasal turbinate, (V) medial side of the ventral nasal turbinate, (VI) lateral side of the ventral nasal turbinate, and (VII) middle nasal turbinate. Statistical significance was determined by one-way ANOVA followed by Tukey’s multiple comparison post hoc test. Different letters represent significant differences (p < 0.05). All data are expressed as mean value of three experiments ± SD. Scale bar: 100 µm.