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Antibodies to the avian B-cell-differentiating hormone bursin (lysyl-histidyl-glycine amide) were raised in mice and rabbits by immunizing with bursin conjugates in Freund's adjuvant. Immunohistochemical staining with these bursin-specific antibodies was restricted to follicular and dendritic reticular epithelial cells of the bursa of Fabricius, and was not found in control avian tissues.

Immunohistochemical localization of bursin in epithelial cells of the avian bursa of Fabricius.