The Purification of the Peking Duck Serum IgM and the Rabbit-anti-duck IgM Antisera and the IgM Expression on the B Lymph Cell in the Fabrician Bursa

• 北京鸭血清IgM及其抗血清的提纯和腔上囊中B淋巴细胞IgM表达的初步研究