Absence of antibody production in the bursa of Fabricius.
D000818:Animals; D000917:Antibody Formation; D001769:Blood; D002060:Bursa of Fabricius; D004912:Erythrocytes; D006460:Hemolysin Proteins; D066298:In Vitro Techniques; D008221:Lymphoid Tissue; D011200:Poultry; D013154:Spleen; D013950:Thymus Gland
D006460:Hemolysin Proteins