A protein present in the cell wall of most staphylococcus aureus strains. The protein selectively binds to the Fc region of human normal and myeloma-derived immunoglobulin g. It elicits antibody activity and may cause hypersensitivity reactions due to histamine release; has also been used as cell surface antigen marker and in the clinical assessment of B lymphocyte function.


Symptoms and diagnosis

Symptoms:

    


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