title: Tonsil-like esophageal lymphoid structures of boid snakes.
mesh_terms: D000818:Animals; D004847:Epithelial Cells; D004947:Esophagus / Q000166:cytology*; D008221:Lymphoid Tissue / Q000098:blood supply / Q000166:cytology*; D009092:Mucous Membrane / Q000166:cytology; D014066:Palatine Tonsil / Q000166:cytology*