Fig. 3

ALNA of Bactrian camel fetus at 10 months of gestation. a the mucosal structure of ALNA (yellow oval area) in the abomasum of Bactrian camel fetus at 10 months of gestation is clearer, and the RMFR and the LMFR are also clearly visible, forming a clear boundary with the surrounding non-ALNA. b Diffusely distributed lymphoid follicles (black arrows) penetrate the muscularis mucosa and extend to the lamina propria. HE, Bar 20 μm. c FAE is columnar epithelium (black arrows) with intercellular lymphocytes (red arrow). H&E stain, Scale bar 20 μm. d Some deeply stained lymphocytes and lightly stained RECs clustered into lymphoid follicles, which contained mitotic cells (red arrows). H&E stain, Scale bar 20 μm