Gregson R L, Davey M J, Prentice D E
Lab Anim. 1979 Jul;13(3):231-8. doi: 10.1258/002367779780937870.
The pattern of development of bronchus-associated lymphoid tissue (BALT) in specified-pathogen-free and conventional (non-barrier maintained) rats over the initial 4 weeks of life appeared to be similar. BALT first appeared around the 2nd week of life and increased in amount over the following 2 weeks. Overlying large nodules of BALT the bronchial epithelium becomes infiltrated by lymphocytes to form a lymphoepithelium. This transformation occurs earlier in conventional rats, possibly because of the differing antigen levels to which they are exposed.
在无特定病原体大鼠和常规（非屏障饲养）大鼠生命最初4周内，支气管相关淋巴组织（BALT）的发育模式似乎相似。BALT最早在出生后第2周左右出现，并在随后的2周内数量增加。在BALT的大结节上方，支气管上皮被淋巴细胞浸润，形成淋巴上皮。这种转变在常规大鼠中出现得更早，可能是因为它们接触的抗原水平不同。
