{HEAD ~ Conditions} resulting in an acquired loss of B cell function that may be ameliorated or treated by administering the polypeptides, antibodies, polynucleotides and agonists or {TAIL ~ antagonists} thereof, include, but are not limited to, HIV Infection, AIDS, bone marrow transplant, and B cell chronic lymphocytic leukemia  
{ HEAD ~ Conditions } resulting in an acquired loss of B cell function that may be ameliorated or treated by administering the polypeptides , antibodies , polynucleotides and agonists or { TAIL ~ antagonists } thereof , include , but are not limited to , HIV Infection , AIDS , bone marrow transplant , and B cell chronic lymphocytic leukemia
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