免疫系统Immunesystem1牛淋巴结切片LymphoidnodeofBullsec.2猪淋巴结切片LymphoidnodeofPigsec.3脾切片Liensec.4猪脾脏切片LienofPigsec.5马脾脏切片LienofHorsesec.6鸡胸腺切片ThymusofChickensec.7鸭腔上囊横切BursaFabriciiofDuckT.S.8小牛胸腺切片ThymusofCalfsec.9猪胸腺切片ThymusofPigsec.10鸡脾脏切片SpleenofChickensec.