Figure 1

HE staining of the anterior part of the nasal respiratory region in pigs of different ages. A Diagrams of cross-section II (corresponding to the anterior part of the respiratory region) of the pig nasal cavity. B–F Representative images of HE-stained nasal anterior respiratory regions from pigs at different ages, including 0 days old (B), 7 days old (C), 30 days old (D), 60 days old (E) and 180 days old (F). The red frame in each figure indicates the superior nasal concha (a) and inferior nasal concha (b), and magnified images of the corresponding region are shown on the right of the figure. Scale bars: B–F 2 mm; (a, b) 50 μm.