免疫系統Immunesystem1牛淋巴結切片LymphoidnodeofBullsec.2豬淋巴結切片LymphoidnodeofPigsec.3脾切片Liensec.4豬脾臟切片LienofPigsec.5馬脾臟切片LienofHorsesec.6雞胸腺切片ThymusofChickensec.7鴨腔上囊橫切BursaFabriciiofDuckT.S.8小牛胸腺切片ThymusofCalfsec.9豬胸腺切片ThymusofPigsec.10雞脾臟切片SpleenofChickensec.