And mammals without IBD, which is similar to the structure of the bone marrow or intestinal lymphoid tissue (set lymph nodes, appendix, etc.), also bursal role.

• 人和哺乳动物无法氏囊，其类似的结构可能是骨髓或肠道中的淋巴组织（集合淋巴结，阑尾等），亦有法氏囊作用。