The distribution of Bursin in major immune organs such as bursa of Fabricius (BF), thymus (Th), Harderian gland(HG) and spleen(Sp) was investigated and compared in both chicken and duck by immuno-histochemical staining method with anti-Bursin monoclonal antibody (McAb)2F9-4. Its distributions in bone marrow(BM) and embryonic organs including BF, Th, BM, HG in chicken were also determined in addition to locating it in germinal center(GC) of Sp and lymphatic nodules of lymphonode in duck. The results showed clearly that Bursin was generally located in immune organs in both chicken and duck. However, its distributive regularity in chick was different from that appeared in duck. In addition, the biological significance on Bursin distribution in immune organs was discussed.
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