Histological staining
Histological examination of the mucosae (H-001, H-009, H-046) revealed that they were all covered with pseudostratified columnar epithelium and contained glands with visible orifices (Table 3, and Fig. 5). These glands appeared to be serous glands, and the presence of goblet cells was not observed. In all three mucosae, a nucleus-free zone was observed between the apical surface of the epithelium and the nuclei of supporting cells; however, this phenomenon was particularly evident in H-009. Additionally, peripheral nerves were distributed beneath the lamina propria in H-009 (Fig. 5).